Tumblr

Short description: Microblogging and social networking website

Tumblr

Screenshot

The Tumblr login/sign up page; a different background image is displayed each time the page is loaded.

Type of business| Subsidiary
Founded| February 2007; 19 years ago (2007-02)[1]
Headquarters| New York City , U.S.
Founder(s)| David Karp
Key people| Matt Mullenweg (CEO)[2]
Industry| Microblogging, social networking service
Employees| 411 (as of June 2017[update])[1]
Parent|

* Yahoo! Inc. (2013–2017)
* Oath (2017–2019)
* Verizon Media (2019)
* Automattic (2019–present)

Website| {{{1}}}

Tumblr (pronounced "tumbler") is a microblogging and social networking website founded by David Karp in 2007 and currently owned by American company Automattic. The service allows users to post multimedia and other content to a short-form blog.

## Contents

* 1 History
* 1.1 Beginnings (2006–2012)
* 1.2 Ownership by Yahoo! (2013–2018)
* 1.3 Automattic (2019–present)
* 2 Features
* 2.1 Blog management
* 2.2 Mobile
* 2.3 Inbox and messaging
* 2.4 Original content
* 2.5 Paid content
* 3 Usage
* 3.1 Tags
* 3.2 LGBTQ+ content and community
* 3.3 Adult content
* 4 Corporate affairs
* 4.1 Funding
* 4.2 Revenue sources
* 5 Criticism
* 5.1 Copyright issues
* 5.2 Security
* 5.3 User interface changes
* 5.4 Userbase behaviour
* 5.5 Promotion of self-harm and suicide
* 5.6 Politics
* 5.7 Censorship
* 5.7.1 Adult content ban
* 6 Notable matters
* 7 See also
* 8 References
* 9 External links

## History

### Beginnings (2006–2012)

Tumblr (original logo shown) was founded by David Karp (left) and Marco Arment (right).

Development of Tumblr began in 2006 during a two-week gap between contracts at David Karp's software consulting company, Davidville.[3][4] Karp had been interested in tumblelogs (short-form blogs, hence the name Tumblr)[5] for some time and was waiting for one of the established blogging platforms to introduce their own tumblelogging platform. As none had done so after a year of waiting, Karp and developer Marco Arment began working on their own platform.[6][7] Tumblr was launched in February 2007,[8][9] and within two weeks had gained 75,000 users.[10] Arment left the company in September 2010 to work on Instapaper.[11]

In June 2012, Tumblr featured its first major brand advertising campaign in collaboration with Adidas, who launched an official soccer Tumblr blog and bought ad placements on the user dashboard. This launch came only two months after Tumblr announced it would be moving towards paid advertising on its site.[12]

### Ownership by Yahoo! (2013–2018)

On May 20, 2013, it was announced that Yahoo and Tumblr had reached an agreement for Yahoo! Inc. to acquire Tumblr for $1.1 billion in cash.[13][14] Many of Tumblr's users were unhappy with the news, causing some to start a petition, achieving nearly 170,000 signatures.[15] David Karp remained CEO and the deal was finalized on June 20, 2013.[16][17] Advertising sales goals were not met and in 2016 Yahoo wrote down $712 million of Tumblr's value.[18]

Verizon Communications acquired Yahoo in June 2017, and placed Yahoo and Tumblr under its Oath subsidiary.[19][20] Karp announced in November 2017 that he would be leaving Tumblr by the end of the year. Jeff D'Onofrio, Tumblr's president and COO, took over leading the company.[21]

The site, along with the rest of the Oath division (renamed Verizon Media Group in 2019), continued to struggle under Verizon. In March 2019, SimilarWeb estimated Tumblr had lost 30% of its user traffic since December 2018, when the site had introduced a stricter content policy with heavier restrictions on adult content (which had been a notable draw to the service).[22] In May 2019, it was reported that Verizon was considering selling the site due to its continued struggles since the purchase[23] (as it had done with another Yahoo property, Flickr, via its sale to SmugMug). Following this news, Pornhub's vice president publicly expressed interest in purchasing Tumblr, with a promise to reinstate the previous adult content policies.[24]

### Automattic (2019–present)

On August 12, 2019, Verizon Media announced that it would sell Tumblr to Automattic, the operator of blog service WordPress.com and corporate backer of the open source blog software of the same name. The sale was for an undisclosed amount, but Axios reported that the sale price was less than $3 million, less than a hundredth of Yahoo's original purchase price. Automattic CEO Matt Mullenweg stated that the site will operate as a complementary service to WordPress.com, and that there were no plans to reverse the content policy decisions made during Verizon ownership.[2]

In November 2022, Mullenweg stated that Tumblr will add support for the decentralized social networking protocol ActivityPub.[25] The next month, Tumblr launched a livestreaming service called Tumblr Live.[26] Tumblr Live is an adapted version of The Meet Group's product Livebox.[27]

In November 2023, most of Tumblr's product development and marketing teams were transferred to other groups within Automattic. Mullenweg stated that focus would shift to core functionality and streamlining existing features.[28] In 2024, Tumblr announced that they would be discontinuing Tumblr Live as of January 24th, with options for users to migrate to MeetMe.[29]

## Features

### Blog management

* Dashboard: The dashboard is the primary tool for the typical Tumblr user. It is a live feed of recent posts from blogs that they follow.[30] Through the dashboard, users are able to comment, reblog, and like posts from other blogs that appear on their dashboard. The dashboard allows the user to upload text posts, images, videos, quotes, or links to their blog with a click of a button displayed at the top of the dashboard. Users are also able to connect their blogs to their Twitter and Facebook accounts, so that whenever they make a post, it will also be sent as a tweet and a status update.[31] As of June 2022, users can also turn off reblogs on specific posts through the dashboard.[32]
* Queue: Users are able to set up a schedule to delay posts that they make. They can spread their posts over several hours or even days.[31]
* Tags: Users can help their audience find posts about certain topics by adding tags. If someone were to upload a picture to their blog and wanted their viewers to find pictures, they would add the tag #picture, and their viewers could use that word to search for posts with the tag #picture.
* HTML editing: Tumblr allows users to edit their blog's theme using HTML to control the appearance of their blog.
* Custom domains: Tumblr allows users to use custom domains for their blogs. Users must purchase a domain from Tumblr Domains, an in-house registrar that provides domains that can only be used with Tumblr unless removed from the user's blog and transferred to another registrar. Blogs previously were able to be linked with any domain/subdomain from any registrar, however following the introduction of the Tumblr Domains service, now requires you to purchase a domain directly from Tumblr to be used with a blog. Users who kept their blogs connected to a domain after the introduction got to keep their custom domain, as long as they don't disconnect it from Tumblr or let the domain expire.[33][34]

### Mobile

With Tumblr's 2009 acquisition of Tumblerette, an iOS application created by Jeff Rock and Garrett Ross, the service launched its official iPhone app.[35][36] The site became available to BlackBerry smartphones on April 17, 2010, via a Mobelux application in BlackBerry World. In June 2012, Tumblr released a new version of its iOS app, Tumblr 3.0, allowing support for Spotify integration, hi-res images and offline access.[37] An app for Android is also available.[38] A Windows Phone app was released on April 23, 2013.[39] An app for Google Glass was released on May 16, 2013.[40]

### Inbox and messaging

Tumblr blogs have the option to allow users to submit questions, either as themselves or anonymously, to the blog for a response. Tumblr also previously offered a "fan mail" function, allowing users to send messages to blogs that they followed.[41][42]

On November 10, 2015, Tumblr introduced an integrated instant messaging function, allowing users to chat with other Tumblr users. The feature was rolled out in a "viral" manner; it was initially made available to a group of 1,500 users, and other users could receive access to the messaging system if they were sent a message by any user that had received access to the system itself. The messaging platform replaces the fan mail system, which was deprecated.[43] The ability to send posts to others via the Dashboard was added the following month.[44]

In November 2019, Tumblr introduced "group chats"—ephemeral chat rooms surfaced via searches, designed to allow users to share content in real-time with users who share their interests. Posts would disappear after 24 hours and could not be edited.[45] The group chat function was discontinued on September 22, 2021.[46][47]

### Original content

In May 2012, Tumblr launched Storyboard, a blog managed by an in-house editorial team which features stories and videos about noteworthy blogs and users on Tumblr.[48] In April 2013, Storyboard was shut down.[49]

In March 2018, Tumblr began to syndicate original video content from Verizon-owned video network go90, as part of an ongoing integration of Oath properties, and reported plans to wind down go90 in favor of using Oath properties to distribute its content instead. This made the respective content available internationally, since go90 is a U.S.-only service.[50][51]

### Paid content

On July 21, 2021, Tumblr launched Post+ for some beta users, allowing bloggers to monetize their content.[52][53]

## Usage

This section may lend undue weight to certain ideas, incidents, or controversies. Please help improve it by rewriting it in a balanced fashion that contextualizes different points of view. (February 2017) (Learn how and when to remove this template message)

|

A Tumblr blog post shown on an information screen in a Dutch train station, 2019

Tumblr has been noted for the socially progressive views of its users.[54][55] In 2011, the service was most popular with the teen and college-aged user segments with half of Tumblr's visitor base being under the age of 25.[56] In April 2013, the website received more than 13 billion global page views.[57]

User activity, measured by the number of blog posts per quarter, peaked at over 100 million in early 2014 and declined in each of the next three years, to approximately 30 million by October 2018.[58]

As of May 2019[update], Tumblr hosted over 465 million blogs and more than 172 billion posts in total[59] with over 21 million posts created on the site each day.[1]

### Tags

The tagging system on the website operates on a hybrid tagging system, involving both self-tagging (user write their own tags on their posts) and an auto-manual function (the website will recommend popular tags and ones that the user has used before.) Only the first 20 tags added to any post will be indexed by the site. The tags are prefaced by a hashtag and separated by commas, and spaces and special characters are allowed, but only up to 140 characters total per tag.[60]

There are two main types used by Tumblr users: descriptive tagging, and opinion or commentary tagging. Descriptive tags are usually introduced by the original poster, and describe what is in the post (i.e. #art, #sky). These are important for the original poster to use, so their post will be indexed and searchable by others wishing to view that subject of content. Tags used as a form of communication are unique to Tumblr, and are typically more personal, expressing opinions, reactions, meta-commentary, background information, and more. Instead of adding onto the reblogged post (with their comments becoming an addition to each subsequent reblog from them) a user may add their comments in the tags, not changing the content or appearance of the original post in any way. Not all users choose to use tags this way, but those who do use tags for commentary prefer it over adding a comment on the actual post.[60][61]

### LGBTQ+ content and community

Multiple researchers looking into Tumblr have found that the website is often used as for community-building and a place to explore identity formation and gender expression for LGBT groups.[62] Prior to the 2018 adult content ban, transgender users posted their personal gender transitioning experiences, including photos of post gender-confirming surgery and the healing process. Many users felt that the ability to be anonymous, or cultivate the identity they were transitioning to, made posting personal information to the website acceptable and safe.[63]

### Adult content

At the time of its acquisition by Yahoo, Tumblr was described by technology journalists as having a sizable amount of pornographic content.[64][65] An analysis conducted by news and technology site TechCrunch on May 20, 2013, showed that over 22% of all traffic in and out of Tumblr was classified as pornography. In addition, a reported 16.45% of blogs on Tumblr exclusively contained pornographic material.[66] Following July 2013 and its acquisition by Yahoo, Tumblr progressively restricted adult content on the site. In July 2013, Tumblr began to filter content in adult-tagged blogs from appearing in search results and tagged displays unless the user was logged in. In February 2018, Safe Mode (which filters "sensitive" content and blogs) became enabled by default for all users on an opt-out basis.[67]

On December 3, 2018, Tumblr announced that effective December 17, all images and videos depicting sex acts, and real-life images and videos depicting human genitalia or "female-presenting" nipples, would be banned from the service. Exceptions are provided for illustrations or art that depict nudity, nudity related to "political or newsworthy speech", and depictions of "female-presenting" nipples in relation to medical events such as childbirth, breastfeeding, mastectomy and gender reassignment surgery. The rules do not apply to text content. All posts in violation of the policy are hidden from public view, and repeat offenders may be reprimanded.[68][69] Shortly prior to the announcement, Tumblr's Android app was patched to remove the ability to disable Safe Mode.[70]

The change faced wide criticism among Tumblr's community; in particular, it has been argued that the service should have focused on other major issues (such as controlling hate speech or the number of porn-related spambots on the service), and that the service's adult community provided a platform for sex education, independent adult performers (especially those representing LGBT communities who feel that they are under-represented by a heteronormative mainstream industry) seeking an outlet for their work, and those seeking a safe haven from "over-policed" platforms to share creative work with adult themes.[71][72][73] Tumblr stated that it was using various algorithms to detect potential violations, in combination with manual reviews.[70] Users quickly discovered a wide array of false positives.[74][75][76] A large number of users scheduled protest actions on December 17.[77]

On the day the ban took effect, Tumblr issued a new post clarifying the new policy, showcasing examples of adult images still allowed on the service, and stating that it "fully recognized" its "special obligation" to serving its LGBT userbase, and that "LGBTQ+ conversations, exploration of sexuality and gender, efforts to document the lives and challenges of those in the sex worker industry, and posts with pictures, videos, and GIFs of gender reassignment surgery are all examples of content that is not only permitted on Tumblr but actively encouraged."[78]

Wired cited multiple potential factors in the ban, including that the presence of adult content made the service unappealing to potential advertisers, the Stop Enabling Sex Traffickers Act (a U.S. federal law which makes websites liable for knowingly assisting or facilitating illegal sex trafficking), as well as heavy restrictions on adult content imposed by Apple for software offered on the iOS App Store (which similarly prompted several Reddit clients to heavily frustrate the ability for users to access forums on the site that contain adult content).[70]

In January 2022, Tumblr reached a settlement with New York City's Commission on Human Rights, which had claimed that the 2018 ban on adult content disproportionately affected LGBTQ+ users. The agreement required the company to review its algorithms, revise its appeals process and review closed cases, and train its human moderators on diversity and inclusion issues.[79] In November 2022, Tumblr changed its rules to allow nudity, but not sexually explicit images.[80]

## Corporate affairs

Tumblr's headquarters were located in the 770 Broadway building in New York City.

Tumblr's headquarters were at 770 Broadway in New York City .[81][82] The company also maintains a support office in Richmond, Virginia.[83] As of June 1, 2017[update], Tumblr had 411 employees.[1] Tumblr (and Automattic) now has a mostly distributed workforce, with a small office in San Francisco.[84][85]

The company's logo is set in Bookman Old Style with some modifications.[86]

### Funding

As of 2011[update], Tumblr had received about $125 million of funding from investors.[87] The company has raised funding from Union Square Ventures, Spark Capital, Martín Varsavsky, John Borthwick (Betaworks), Fred Seibert, Krum Capital, and Sequoia Capital (among other investors).[88][89][90]

In its first round of funding in October 2007, Tumblr raised $750,000 from Spark Capital and Union Square Ventures.[91] In December 2008 the company raised $4.5 million in Series B funding[92] and a further $5 million in April 2010.[93] In December 2010, Tumblr raised $30 million in Series D funding.[94] The company had an $800 million valuation in August 2011.[95] In September 2011, the company raised $85 million in a round of funding led by Greylock Partners and Insight Venture Partners.[96]

### Revenue sources

In an interview with Nicole Lapin of Bloomberg West on September 7, 2012, David Karp said the site was monetized by advertising. Their first advertising launch started in May 2012 after 16 experimental campaigns.[97] Tumblr made $13 million in revenue in 2012 and hoped to make $100 million in 2013. Tumblr reportedly spent $25 million to fund operations in 2012.[87]

In 2013, Tumblr began allowing companies to pay to promote their own posts to a larger audience. Tumblr Head of Sales, Lee Brown, has quoted the average ad purchase on Tumblr to be nearly six figures.[98] Tumblr also allows premium theme templates to be sold for use by blogs.[99]

In July 2016, advertisements were implemented by default across all blogs. Users may opt-out, and the service stated that a revenue sharing program would be implemented at a later date.[100]

In February 2022, Tumblr launched an ad-free subscription option that removes the marketing from microblogs for $5 per month, or $40 per year.[101]

During an AMA on 11 July 2023, the CEO said that Tumblr was financially in the red, losing 30 million a year.[102][103]

## Criticism

### Copyright issues

Tumblr has received criticism for copyright violations by participating bloggers;[104] however, Tumblr accepts Digital Millennium Copyright Act (DMCA) take-down notices.[105] Tumblr's visual appeal has made it ideal for photoblogs that often include copyrighted works from others that are re-published without payment.[106] Tumblr users can post unoriginal content by "Reblogging", a feature on Tumblr that allows users to re-post content taken from another blog onto their own blog with attribution.[104][107]

### Security

Tumblr has been forced to manage spam and security problems. For example, a chain letter scam in May 2011 affected 130,000 users.[108]

On December 3, 2012, Tumblr was attacked by a cross-site scripting worm deployed by the internet troll group Gay Nigger Association of America. The message urged users to harm themselves and criticized blogging in general.[109]

### User interface changes

In 2015, Tumblr faced criticism by users for changes to its reblog mechanisms. In July 2015, the system was modified so that users cannot remove or edit individual comments by other users when reblogging a post; existing comments can only be removed all at once. Tumblr staff argued that the change was intended to combat "misattribution", though this move was met by criticism from 'ask blogs' and "RP blogs', which often shortened long chains of reblogs between users to improve readability. In September 2015, Tumblr changed how threads of comments on reblogged posts are displayed; rather than a nested view with indentations for each post, all reblogs are now shown in a flat view, and user avatars were also added. The change was intended to improve the legibility of reblogs, especially on mobile platforms, and complements the inability to edit existing comments. Although some users had requested such a change to combat posts made illegible by extremely large numbers of comments on a reblogged post, the majority of users (even those who had requested such a change) criticized the new format. The Verge was also critical of the changes, noting that it was cleaner, but made the site lose its "nostalgic charm".[110][111]

### Userbase behaviour

While Tumblr's userbase has generally been received as accommodating people from a wide range of ideologies and identities, a common point of criticism is that attitudes from users on the site stifle discussion and discourse. In 2015, members of the Steven Universe fandom drove an artist to the point of attempting suicide over their artwork, in which they drew characters thin that are typically seen as being 'fat' in the show.[112] In 2018, Kotaku reporter Gita Jackson described the site as a 'joyless black hole', citing how the website's design and functionality led to 'fandoms spinning out of control', as well as an environment which inhibited discussion and discourse.[113]

### Promotion of self-harm and suicide

In February 2012, Tumblr banned blogs that promote or advocate suicide, self-harm and eating disorders (pro-ana).[114]

The suicide of a British teenager, Tallulah Wilson, raised the issue of suicide and self-harm promotion on Tumblr as Wilson was reported to have maintained a self-harm blog on the site. A user on the site is reported to have sent Wilson an image of a noose accompanied by the message: "here is your new necklace, try it on." In response to the Wilson case, Maria Miller, the UK's minister for culture, media, and sport, said that social media sites like Tumblr need to remove "toxic" self-harm content.[115][116]

Searching terms like "depression", "anxiety", and "suicide" on Tumblr now brings up a PSA page directing the user to resources like the National Suicide Prevention Lifeline, The Trevor Project, the National Eating Disorders Association, and RAINN, as well as an option to continue to the search results.[117]

There are concerns of some Tumblr posts glorifying suicide and depression among young people.[118]

### Politics

In February 2018, BuzzFeed published a report claiming that Tumblr was utilized as a distribution channel for Russian agents to influence American voting habits during the 2016 presidential election.[119]

Despite policies forbidding hate speech, Tumblr has been noted for hosting content from Neo-Nazis and white supremacists.[120] In May 2020, Tumblr announced that it will remove reblogs of terminated hate speech posts, specifically Nazi and white supremacist content.[121]

### Censorship

Several countries have blocked access to Tumblr because of pornography, religious extremism or LGBT content. These countries include China,[122] Indonesia, Kazakhstan[123] and Iran.[124] In February 2016, the Indonesian government temporarily blocked access to Tumblr within the country because the site hosted pages that carried pornography. The government shortly reversed its decision to block the site and said it had asked Tumblr to self-censor its pornographic content.[125]

#### Adult content ban

In November 2018, Tumblr's iOS app was removed by Apple from its App Store after illegal child pornography was found on the service. Tumblr stated that all images uploaded to the service are scanned against an industry database, but that a "routine audit" had revealed images that had not yet been added to the database.[126] In the wake of the incident, a number of Tumblr blogs—particularly those dealing primarily in adult-tagged artwork such as erotica, as well as art study and anatomy resources—were also deleted, with affected users taking to other platforms (such as Twitter) to warn others and complain about the deletions, as well as encourage users to back up their blog's contents.[127][128] Tumblr subsequently removed the ability to disable "Safe Mode" from its Android app,[70] and announced a wider ban on explicit images of sex acts and nudity on the platform with certain limited exceptions.[68] Tumblr deployed an automatic content recognition system which resulted in many non-pornographic images being removed from the platform.[129] In December 2018, about a month after it was initially banned, Tumblr's iOS app was restored to the app store.[130]

The site was known for its popularity with adult content that attracted women and catered for other under-served audiences.[131]

## Notable matters

On October 21, 2011, then-U.S. President Barack Obama created a Tumblr account.[132]

In late 2015, a user on the website went viral after allegedly having collected human bones at a graveyard, sparking a controversy known as "Boneghazi" (a portmanteau of bone + Benghazi). The user, from New Orleans, Louisiana, had offered to share the human bones reportedly procured from Holt Cemetery by making a post in a Facebook group known as the "Queer Witch Collective". The Facebook post was later re-posted to Tumblr by another user, and the account from Facebook was traced to a profile on Tumblr due to the profile pictures matching.[133] In January 2016, the user's home was searched by law enforcement, where they found 11 bones and four teeth.[134][135][136]

## See also

* Comparison of microblogging and similar services
* Comparison of free blog hosting services
* List of social networking services
* List of tech companies in the New York metropolitan area

## References

1. ↑ 1.0 1.1 1.2 1.3 "Press Information". Tumblr. http://www.tumblr.com/press.
2. ↑ 2.0 2.1 Alexander, Julia (August 12, 2019). "Verizon is selling Tumblr to WordPress' owner". https://www.theverge.com/2019/8/12/20802639/tumblr-verizon-sold-wordpress-blogging-yahoo-adult-content.
3. ↑ Karp, David; Alexandria, Julie (May 27, 2008). David Karp and Tumblr (Video). Wallstrip. Event occurs at 1:30. Archived from the original on August 15, 2013. Retrieved February 24, 2013. "Sometime in 2006, we had a couple of weeks between contracts and said 'Let's see what we can do, let's see if we can build this thing', and we threw together the first working version of Tumblr."
4. ↑ ""Tumblr: David Karp's $800 Million Art Project" Forbes, January 2, 2013". Forbes.com. April 18, 2012. https://www.forbes.com/sites/jeffbercovici/2013/01/02/tumblr-david-karps-800-million-art-project/2/. Retrieved April 17, 2013.
5. ↑ Cosgrove, Lauren. "Why Is Tumblr Called Tumblr? | Rewind & Capture". https://www.rewindandcapture.com/why-is-tumblr-called-tumblr/.
6. ↑ Davis, Sammy (August 27, 2008). "So What Do You Do, David Karp, Founder of Tumblr?". Mediabistro.com. http://www.mediabistro.com/So-What-Do-You-Do-David-Karp-Founder-of-Tumblr-a10281.html.
7. ↑ Shafrir, Doree (January 15, 2008). "Would You Take a Tumblr With This Man?". The New York Observer. http://observer.com/2008/01/would-you-take-a-tumblr-with-this-man/?show=all.
8. ↑ Karp, David (December 12, 2011). David Karp: When It All Came Together (Video). Fast Company. Event occurs at 1:03. Archived from the original on July 29, 2013. Retrieved February 24, 2013. "Over the next few months, we kind of pieced together what became the first version of Tumblr which launched in February 2007."
9. ↑ Karp, David (February 19, 2007). "Tumblr – something we've always wanted". Davidville. https://davidville.wordpress.com/2007/02/19/tumblr/.
10. ↑ Ingram, Matthew (August 25, 2010). "Google VC, Tumblr CEO Among the Top Innovators Under 35". GigaOM. Giga Omni Media. http://gigaom.com/2010/08/25/google-vc-tumblr-ceo-among-the-top-innovators-under-35/.
11. ↑ Frommer, Dan (September 21, 2010). "Tumblr CTO Steps Down To Focus on Instapaper, Independent Career". Business Insider. http://www.businessinsider.com/tumblr-cto-steps-down-to-focus-on-instapaper-independent-career-2010-9.
12. ↑ Delo, Cotton (June 8, 2012). "Tumblr Unveils First Major Brand Campaign for Adidas". Advertising Age. Crain Communications. http://adage.com/article/digital/tumblr-unveils-major-brand-campaign-adidas/235262/.
13. ↑ Yahoo to buy Tumblr for $1.1 billion: Report , CNN.com. Retrieved May 21, 2013.
14. ↑ "Yahoo's Board Approves $1.1 Billion Purchase of Tumblr". http://www.businessinsider.com/yahoos-board-approves-11-billion-purchase-of-tumblr-2013-5.
15. ↑ Lunden, Ingrid (May 18, 2013). "Hell No, Tumblr Users Won't Go To Yahoo!". Techcrunch. https://techcrunch.com/2013/05/18/hell-no-tumblr-users-wont-go-to-yahoo/.
16. ↑ Mayer, Marissa (May 20, 2013). "Tumblr. + Yahoo! = !!". http://yahoo.tumblr.com/post/50902111638/tumblr-yahoo.
17. ↑ "Yahoo! to Acquire Tumblr" (Press release). Yahoo!. May 20, 2013. Archived from the original on May 24, 2013. Retrieved May 20, 2013.
18. ↑ Fiegerman, Seth (July 18, 2016). "Yahoo 'screws it up,' writes down $482 million of Tumblr". CNNMoney. https://money.cnn.com/2016/07/18/technology/yahoo-q2-earnings-tumblr/.
19. ↑ Goel, Vindu (June 13, 2017). "Verizon completes $4.48 billion purchase of Yahoo, ending an era". The New York Times. https://www.nytimes.com/2017/06/13/technology/yahoo-verizon-marissa-mayer.html.
20. ↑ Blodget, Henry (May 20, 2013). "Yahoo CEO Marissa Mayer Buys Tumblr–Her Boldest Move Yet". Yahoo Finance. https://finance.yahoo.com/blogs/daily-ticker/yahoo-ceo-marissa-mayer-buys-tumblr-her-boldest-150522231.html.
21. ↑ Lunden, Ingrid (November 28, 2017). "David Karp is leaving Tumblr". https://techcrunch.com/2017/11/27/david-karp-is-leaving-tumblr-by-the-end-of-the-year/.
22. ↑ Liao, Shannon (March 14, 2019). "After the porn ban, Tumblr users have ditched the platform as promised". https://www.theverge.com/2019/3/14/18266013/tumblr-porn-ban-lost-users-down-traffic.
23. ↑ Welch, Chris (May 2, 2019). "Verizon is looking to sell Tumblr after squandering its potential". https://www.theverge.com/2019/5/2/18527177/verizon-seeking-tumblr-sale-rumor-blogging.
24. ↑ Brodkin, Jon (May 3, 2019). "Pornhub wants to buy Tumblr and restore site to former porn-filled glory" (in en-us). https://arstechnica.com/information-technology/2019/05/pornhub-wants-to-buy-tumblr-and-restore-site-to-former-porn-filled-glory/.
25. ↑ Perez, Sarah (2022-11-21). "Tumblr to add support for ActivityPub, the social protocol powering Mastodon and other apps". https://techcrunch.com/2022/11/21/tumblr-to-add-support-for-activitypub-the-social-protocol-powering-mastodon-and-other-apps/.
26. ↑ Robertson, Adi (2022-12-19). "Tumblr is launching a livestreaming feature" (in en-US). https://www.theverge.com/2022/12/19/23517656/tumblr-live-livestreaming-livebox-meet-group-feature-ios-android.
27. ↑ King, Ashley (2022-12-21). "Tumblr Joins Livestreaming Band Wagon with New Service" (in en-US). https://www.digitalmusicnews.com/2022/12/20/tumblr-launches-live-streaming/.
28. ↑ Robertson, Adi (2023-11-09). "Tumblr is downscaling after failing to 'turn around' the site" (in en). https://www.theverge.com/2023/11/9/23954412/tumblr-downscaling-employees-transferred-automattic.
29. ↑ "Tumblr Live Is Shutting Down - Help Center". https://help.tumblr.com/hc/en-us/articles/20438412142999-Tumblr-Live-Is-Shutting-Down.
30. ↑ "Cumulative total of Tumblr posts between May 2011 and April 2013 (in billions)". Statista. http://www.statista.com/statistics/221565/total-cumulative-number-of-tumblr-posts/.
31. ↑ 31.0 31.1 "Tumblr Help: Posts". Tumblr.com. http://www.tumblr.com/docs/en/advanced_post_options.
32. ↑ Sato, Mia (June 2, 2022). "Tumblr is adding a feature to disable reblogs of posts". https://www.theverge.com/2022/6/2/23151990/tumblr-disable-reblog-controls-settings.
33. ↑ "Legacy Domains - Tumblr Support". https://help.tumblr.com/hc/en-us/articles/231256548-Legacy-Domains.
34. ↑ staff (2023-06-20). "Tumblr Domains: That thing you do in the place they already know". https://staff.tumblr.com/post/720657694645714944/tumblr-domains-that-thing-you-do-in-the-place.
35. ↑ Van Grove, Jennifer (February 25, 2009). "Tumblr Rebrands Tumblerette and Releases Free iPhone App". http://mashable.com/2009/02/25/tumblr-iphone-app/.
36. ↑ "Tumblerette is now the official Tumblr iPhone App! (and it's free!)". February 25, 2009. http://staff.tumblr.com/post/81463386/iphone-app.
37. ↑ Perez, Sarah (June 21, 2012). "Better, Stronger, Faster: Tumblr 3.0 For iPhone Has Arrived". TechCrunch. https://techcrunch.com/2012/06/21/better-stronger-faster-tumblr-3-0-for-iphone-has-arrived/.
38. ↑ Kerr, Dara (April 8, 2013). "Tumblr rolls out its newfangled Android app". CNET. http://news.cnet.com/8301-1035_3-57578553-94/tumblr-rolls-out-its-newfangled-android-app/.
39. ↑ Welch, Chris (April 23, 2013). "Tumblr comes to Windows Phone with lock screen, live tile enhancements". The Verge. https://www.theverge.com/2013/4/23/4256908/tumblr-app-windows-phone-now-available.
40. ↑ Tibken, Shara (May 16, 2013). "Google: Check out our new Glassware like Tumblr". CNET (CBS Interactive). http://news.cnet.com/8301-1023_3-57584885-93/google-check-out-our-new-glassware-like-tumblr/.
41. ↑ "Tumblr releases Fan Mail for private messaging". January 4, 2012. https://venturebeat.com/2012/01/04/tumblr-fan-mail/.
42. ↑ "Tumblr Rolls Out Instant Messaging On Both Web And Mobile". AOL. November 10, 2015. https://techcrunch.com/2015/11/10/tumblr-rolls-out-instant-messaging-on-both-web-and-mobile/.
43. ↑ "Tumblr launches instant messaging on Android, iOS, and the web". Vox Media. November 10, 2015. https://www.theverge.com/2015/11/10/9706232/tumblr-instant-messaging-announced.
44. ↑ Swanner, Nate (December 10, 2015). "Tumblr now lets you send posts as messages, and supports Live Photos on iOS" (in en-US). The Next Web. https://thenextweb.com/apps/2015/12/10/tumblr-now-lets-you-send-posts-as-messages-and-supports-live-photos-on-ios/.
45. ↑ Radulovic, Petrana (November 6, 2019). "Tumblr just added a group chat function" (in en). https://www.polygon.com/2019/11/6/20947674/tumblr-feature-group-chats-search-moderation.
46. ↑ "Group Chats". Tumblr Help Centre. https://tumblr.zendesk.com/hc/en-us/articles/360011864353-Group-Chats.
47. ↑ "All good things...". Tumblr Staff blog. September 9, 2021. https://staff.tumblr.com/post/661879317474721792/all-good-things.
48. ↑ Weber, Harrison (May 7, 2012). "Tumblr's editorial hires lead to "Storyboard," a hub to feature creative users". The Next Web. https://thenextweb.com/apps/2012/05/07/tumblrs-editorial-hires-lead-to-storyboard-a-hub-to-feature-creative-users/.
49. ↑ Faircloth, Kelly (April 9, 2013). "Tumblr Kills Storyboard; Editorial Employees Will Be 'Moving On'". Betabeat. http://betabeat.com/2013/04/tumblr-editorial-layoffs-storyboard-david-karp/.
50. ↑ "With Go90 flatlining, Verizon sees Tumblr as home to original digital video programs" (in en-US). Digiday. April 20, 2018. https://digiday.com/media/verizon-turns-tumblr-original-show-hub-go90-struggled-become/.
51. ↑ Roettgers, Janko (February 13, 2018). "Oath CEO Tim Armstrong Casts Doubt on Future of Go90" (in en-US). Variety. https://variety.com/2018/digital/news/oath-ceo-tim-armstrong-go90-1202696674/.
52. ↑ Silberling, Amanda (July 21, 2021). "Tumblr debuts Post+, a subscription service for Gen Z creators". TechCrunch. https://techcrunch.com/2021/07/21/tumblr-debuts-post-a-subscription-service-for-gen-z-creators.
53. ↑ McKay, Tom (July 21, 2021). "Tumblr Now Allows Creators to Charge for Content—You Know, Except for Porn, Which Is Still Banned". Gizmodo. https://gizmodo.com/tumblr-now-allows-creators-to-charge-for-content-you-kn-1847337448.
54. ↑ Sands, Mason. "Tumblocalypse: Where Tumblr And Its Users Are Headed After The Ban" (in en). https://www.forbes.com/sites/masonsands/2018/12/20/tumblocalypse-where-tumblr-and-its-users-are-headed-after-the-ban/.
55. ↑ Sarappo, Emma (December 13, 2018). "How Tumblr Taught Social Justice to a Generation of Teenagers" (in en). https://psmag.com/social-justice/how-tumblr-taught-social-justice-to-a-generation-of-teenagers.
56. ↑ Lipsman, Andrew (August 30, 2011). "Tumblr Defies its Name as User Growth Accelerates". comScore. http://blog.comscore.com/2011/08/tumblr_user_growth_accelerates.html.
57. ↑ MacMillan, Douglas (May 19, 2013). "Yahoo's board approves $1.1 billion purchase of Tumblr, WSJ says". The Washington Post. https://www.washingtonpost.com/business/economy/yahoos-board-approves-11-billion-purchase-of-tumblr-wsj-says/2013/05/19/696bdc94-c0ba-11e2-8bd8-2788030e6b44_story.html.
58. ↑ "Tumblr: Total number of posts 2018 | Statistic". https://www.statista.com/statistics/221565/total-cumulative-number-of-tumblr-posts/.
59. ↑ "About Us". Tumblr. http://www.tumblr.com/about.
60. ↑ 60.0 60.1 Price, Ludi; Robinson, Lyn (January 1, 2021). "Tag analysis as a tool for investigating information behaviour: comparing fan-tagging on Tumblr, Archive of Our Own and Etsy" (in en). Journal of Documentation 77 (2): 320–358. doi:10.1108/JD-05-2020-0089. ISSN 0022-0418. https://openaccess.city.ac.uk/id/eprint/25454/1/_system_appendPDF_proof_hi (1).pdf. Retrieved March 28, 2022.
61. ↑ Bourlai, Elli E. (April 1, 2018). "'Comments in Tags, Please!': Tagging practices on Tumblr" (in en). Discourse, Context & Media 22: 46–56. doi:10.1016/j.dcm.2017.08.003.
62. ↑ Jacobsen, Kai; Devor, Aaron; Hodge, Edwin (January 1, 2022). "Who Counts as Trans? A Critical Discourse Analysis of Trans Tumblr Posts" (in en). Journal of Communication Inquiry 46 (1): 60–81. doi:10.1177/01968599211040835. ISSN 0196-8599. http://journals.sagepub.com/doi/10.1177/01968599211040835. Retrieved March 28, 2022.
63. ↑ Haimson, Oliver L.; Dame-Griff, Avery; Capello, Elias; Richter, Zahari (April 3, 2021). "Tumblr was a trans technology: the meaning, importance, history, and future of trans technologies" (in en). Feminist Media Studies 21 (3): 345–361. doi:10.1080/14680777.2019.1678505. ISSN 1468-0777. https://www.tandfonline.com/doi/full/10.1080/14680777.2019.1678505. Retrieved March 28, 2022.
64. ↑ Kafka, Peter (May 18, 2013). "Why Yahoo Doesn't Think Tumblr Has a Porn Problem". All Things Digital. http://allthingsd.com/20130518/why-yahoo-doesnt-think-tumblr-has-a-porn-problem/.
65. ↑ de la Merced, Michael J.; Bilton, Nick; Perlroth, Nicole (May 19, 2013). "Yahoo to Buy Tumblr for $1.1 Billion". The New York Times: p. A1. http://www.nytimes.com/2013/05/20/technology/yahoo-to-buy-tumblr-for-1-1-billion.html?pagewanted=all&_r=1&.
66. ↑ "Tumblr's Adult Fare Accounts For 11.4% Of Site's Top 200K Domains, Adult Sites Are Leading Category Of Referrals". TechCrunch. May 20, 2013. https://techcrunch.com/2013/05/20/tumblrs-adult-fare-accounts-for-11-4-of-sites-top-200k-domains-tumblrs-adult-fare-accounts-for-11-4-of-sites-top-200k-domains-adults-sites-are-leading-category-of-referrals/.
67. ↑ "Tumblr Is Turning 'Safe Mode' on by Default for Everyone" (in en-us). Motherboard. February 8, 2018. https://motherboard.vice.com/en_us/article/3k7qe5/turning-tumblr-safe-mode-on-by-default.
68. ↑ 68.0 68.1 "Tumblr will ban all adult content on December 17th". The Verge. https://www.theverge.com/2018/12/3/18123752/tumblr-adult-content-porn-ban-date-explicit-changes-why-safe-mode.
69. ↑ "Adult content" (in en-US). https://tumblr.zendesk.com/hc/en-us/articles/231885248-Sensitive-content.
70. ↑ 70.0 70.1 70.2 70.3 Martineau, Paris (December 4, 2018). "Tumblr's Porn Ban Reveals Who Controls What We See Online". Wired. ISSN 1059-1028. https://www.wired.com/story/tumblrs-porn-ban-reveals-controls-we-see-online/. Retrieved December 9, 2018.
71. ↑ "Apple Sucked Tumblr Into Its Walled Garden, Where Sex Is Bad" (in en-us). Motherboard. December 3, 2018. https://motherboard.vice.com/en_us/article/a3mjxg/apple-tumblr-porn-nsfw-adult-content-banned.
72. ↑ "Verizon takes aim at Tumblr's kneecaps, bans all adult content" (in en-us). Ars Technica. https://arstechnica.com/gaming/2018/12/verizon-takes-aim-at-tumblrs-kneecaps-bans-all-adult-content/.
73. ↑ Stephen, Bijan (December 6, 2018). "Tumblr's porn ban could be its downfall — after all, it happened to LiveJournal". https://www.theverge.com/2018/12/6/18127869/tumblr-livejournal-porn-ban-strikethrough.
74. ↑ Rogers, Kaleigh; Koebler, Jason (December 4, 2018). "Tumblr's Algorithm Thinks Vomiting Unicorns, Raw Chicken, and Boot Cleaners Are Porn" (in en-US). https://motherboard.vice.com/en_us/article/a3mn7p/tumblrs-algorithm-thinks-vomiting-unicorns-raw-chicken-and-boot-cleaners-are-porn.
75. ↑ Radulovic, Petrana (December 4, 2018). "Tumblr's wonky algorithm is flagging innocent posts as adult content". https://www.polygon.com/2018/12/4/18125997/tumblr-nsfw-guidelines-flagging-algorithm.
76. ↑ Matsakis, Louise (December 5, 2018). "Tumblr's Porn-Detecting AI Has One Job—and It's Bad at It". Wired. ISSN 1059-1028. https://www.wired.com/story/tumblr-porn-ai-adult-content/. Retrieved December 6, 2018.
77. ↑ Radulovic, Petrana (December 17, 2018). "Tumblr users are logging off to protest new guidelines, but will it work?". https://www.polygon.com/2018/12/17/18144625/tumblr-nsfw-guidelines-ban-protest.
78. ↑ "As adult content ban arrives, Tumblr clarifies and refines rules" (in en-US). December 17, 2018. https://techcrunch.com/2018/12/17/as-adult-content-ban-arrives-tumblr-clarifies-and-refines-rules/.
79. ↑ Robertson, Adi (February 25, 2022). "Tumblr is settling with NYC's human rights agency over alleged porn ban bias" (in en). https://www.theverge.com/2022/2/25/22949293/tumblr-nycchr-settlement-adult-content-ban-algorithmic-bias-lgbtq.
80. ↑ Robertson, Adi (1 November 2022). "Tumblr will now allow nudity but not explicit sex". https://www.theverge.com/2022/11/1/23435516/tumblr-porn-ban-modified-nudity-allowed-sexually-explicit-depictions-banned.
81. ↑ Goodman, Daniel (January 12, 2012). "Tumblr Office Tour". http://www.businessinsider.com/photos-tumblr-office-nyc-2012-01?op=1.
82. ↑ McGeehan, Patrick (May 9, 2012). "Technology Industry Seen Growing Fastest in New York". New York Times. https://www.nytimes.com/2012/05/10/nyregion/new-yorks-tech-industry-tops-us-in-growth-study-finds.html?_r=1&.
83. ↑ Cocke, Annie; Tatti, Katelyn (March 30, 2012). "Tumblr grows rapidly, moves to larger Richmond office". WTVR-TV. http://wtvr.com/2012/03/30/tumblr-grows-rapidly-moves-to-larger-richmond-office/.
84. ↑ "About Tumblr". https://about.tumblr.com/.
85. ↑ "About Us" (in en). 2005-07-23. https://automattic.com/about/.
86. ↑ Coles, Stephen (December 3, 2013). "Tumblr Logo, 2007–2013". Fonts in Use. http://fontsinuse.com/uses/5323/tumblr-logo-2007-2013.
87. ↑ 87.0 87.1 Edwards, Jim. "Here's Tumblr's Total Revenue For 2012 – And How It Will Make A Profit in 2013". http://www.businessinsider.com/heres-tumblrs-total-revenue-for-2012-and-how-it-will-make-a-profit-in-2013-2013-1.
88. ↑ "Best Young Tech Entrepreneurs 2009". http://images.businessweek.com/ss/09/04/0421_best_young_entrepreneurs/11.htm.
89. ↑ Anthony Ha, VentureBeat. "Blog startup Tumblr goes bi-coastal with Sequoia Investment ." November 12, 2010.
90. ↑ Dans, Enrique (May 19, 2013). "David Karp y Tumblr: el momento de la verdad". http://www.enriquedans.com/2013/05/david-karp-y-tumblr-el-momento-de-la-verdad.html#.
91. ↑ Marshall, Matt (October 22, 2007). "Roundup: Brightroll, Tumblr, Collective, Veeker, MobileEye, all raise cash". VentureBeat. https://venturebeat.com/2007/10/22/roundup-brightroll-tumblr-collective-veeker-mobileeye-all-raise-cash/.
92. ↑ Kafka, Peter (December 11, 2008). "Who Said Web 2.0 Was R.I.P.? Microblog Tumblr Raises $4.5 Million, Expectations.". All Things Digital. Dow Jones & Company. http://allthingsd.com/20081211/who-said-web-20-was-rip-microblog-tumblr-raises-45-million-expectations/.
93. ↑ Kafka, Peter (April 20, 2010). "Tumblr Raises Another $5 Million From Spark and Union Square. Now It Wants Your Money.". All Things Digital. Dow Jones & Company. http://allthingsd.com/20100420/tumblr-raises-another-5-million-from-spark-and-union-square-now-it-wants-your-money/.
94. ↑ Lynley, Matthew (December 17, 2010). "Tumblr brings in $30M despite stability woes". VentureBeat. https://venturebeat.com/2010/12/17/tumblr-funding-seriesd/.
95. ↑ Ludwig, Sean (August 26, 2011). "Tumblr on verge of raising up to $100M with massive $800M valuation". VentureBeat. https://venturebeat.com/2011/08/26/tumblr-on-verge-of-raising-up-to-100m-with-massive-800m-valuation/.
96. ↑ Ludwig, Sean (September 26, 2011). "Tumblr grabs another $85M in fresh funding". VentureBeat. https://venturebeat.com/2011/09/26/tumblr-raises-85m-greylock/.
97. ↑ Lapin, Nicole (September 5, 2012). ""Tumblr Has 'Ways to Go' Before IPO, CEO Says" 9-5-12". Bloomberg West. https://www.bloomberg.com/video/tumblr-has-ways-to-go-before-ipo-ceo-says-Y6Yu8w~qQP~MiuZcxhDdnQ.html.
98. ↑ Frier, Sarah (March 5, 2013). "Tumblr to Introduce Mobile Advertising to Help Achieve Profit". Bloomberg.com (Bloomberg). https://www.bloomberg.com/news/2013-03-05/tumblr-to-introduce-mobile-advertising-to-help-achieve-profit.html.
99. ↑ Voakes, Greg (August 14, 2013). "How Pixel Union Built a Business on Tumblr Themes" (in en-US). https://www.huffingtonpost.com/greg-voakes/how-pixel-union-built-a-b_b_3750446.html.
100. ↑ "Tumblr will allow users to make money from ads". July 28, 2016. https://www.theverge.com/2016/7/28/12307484/tumblr-advertising-user-blogs-revenue.
101. ↑ Fingas, Jon (February 24, 2022). "Tumblr is available ad-free for $5 per month" (in en-US). https://www.engadget.com/tumblr-ad-free-subscription-202934348.html.
102. ↑ "Tumblr Is in the Red and Losing $30 Million Every Year" (in en). 2023-07-12. https://gizmodo.com/tumblr-losing-30-million-per-year-ceo-says-in-the-red-1850633390.
103. ↑ Silberling, Amanda (2023-07-12). "Tumblr is losing $30M each year, CEO says" (in en-US). https://techcrunch.com/2023/07/12/tumblr-is-losing-30m-each-year-ceo-says/.
104. ↑ 104.0 104.1 Edwards, Jim. "Why Tumblr Needs Adult Supervision Right Now". http://www.businessinsider.com/tumblr-fashion-directors-exit-could-mean-entry-of-adult-supervision-2011-11.
105. ↑ "DMCA Copyright Notifications". Tumblr. https://www.tumblr.com/dmca.
106. ↑ Edwards, Jim (September 12, 2011). "Why Tumblr Must Kill What Made it Big: Porn and Copyright Violations". CBSNews.com. http://www.cbsnews.com/news/why-tumblr-must-kill-what-made-it-big-porn-and-copyright-violations.
107. ↑ "Tumblr: A New Way of Blogging". https://sites.google.com/site/xwarneritessay/5.
108. ↑ Leyden, John (May 17, 2011). "Tumblr bloggrs ensnared in chain-spam scam". https://www.theregister.co.uk/2011/05/17/tumblr_chain_letter_scam/.
109. ↑ "Massive worm hits Tumblr, spams big blogs like USA today". December 3, 2012. http://news.cnet.com/8301-1009_3-57556784-83/massive-worm-hits-tumblr-spams-big-blogs-like-usa-today/.
110. ↑ "Tumblr users are not happy about the site's new redesign". September 2, 2015. http://www.dailydot.com/technology/tumblr-reblog-redesign-2015/.
111. ↑ "Tumblr reblogs just got a lot cleaner, and a little less charming". September 4, 2015. https://www.theverge.com/2015/9/3/9258925/tumblr-reblogs-redesign-mobile.
112. ↑ Nguyen, Clinton (November 6, 2015). "An Attempted Suicide Forced a Tumblr Community to Open Its Eyes About Bullying" (in en). https://www.vice.com/en_us/article/3da838/an-attempted-suicide-forced-a-tumblr-community-to-open-its-eyes-about-bullying.
113. ↑ "In 2018, Tumblr Is A Joyless Black Hole" (in en-us). July 2, 2018. https://kotaku.com/in-2018-tumblr-is-a-joyless-black-hole-1827294865.
114. ↑ "A New Policy Against Self-Harm Blogs". Tumblr Staff Blog. February 23, 2012. http://staff.tumblr.com/post/18132624829/self-harm-blogs.
115. ↑ "Maria Miller: Time for a crackdown on social media 'poison'". The Telegraph. January 27, 2014. https://www.telegraph.co.uk/technology/social-media/10597877/Maria-Miller-Time-for-a-crackdown-on-social-media-poison.html.
116. ↑ Hern, Alex (January 27, 2014). "Social networks to face government grilling over suicide content". The Guardian. https://www.theguardian.com/technology/2014/jan/27/social-networks-to-face-government-grilling-over-suicide-promotion.
117. ↑ Kliegman, Julie (April 24, 2017). "The New Era of Suicide Prevention". https://www.theringer.com/2017/4/24/16038130/social-media-suicide-prevention-policies-5490c2c224e0.
118. ↑ Becker, Mayer, Nagenborg, El-Faddagh, & Schmidt, 2004; Duggan, Heath, Lewis, & Baxter, 2012; Lewis, Heath, St. Denis, & Noble, 2011; Mitchell & Ybarra, 2007; Whitlock, Powers, & Eckenrode, 2006
119. ↑ Silverman, Craig (February 6, 2018). "Russian Trolls Ran Rampant On Tumblr And The Company Refuses To Say Anything About It". BuzzFeed. https://www.buzzfeed.com/craigsilverman/russian-trolls-ran-wild-on-tumblr-and-the-company-refuses.
120. ↑ "Tumblr's nudity ban removes one of the last major refuges for pornography on social media". Washington Post. December 3, 2018. https://www.washingtonpost.com/business/2018/12/04/tumblrs-nudity-crackdown-means-pornography-will-be-harder-find-its-platform-than-nazi-propaganda/.
121. ↑ "Tumblr will now remove all reblogs of posts that violate its hate speech policy". May 4, 2020. https://www.theverge.com/2020/5/4/21247437/tumblr-hate-speech-reblog-removal-nazis-white-supremacist-content.
122. ↑ "Tech in Asia - Connecting Asia's startup ecosystem". https://www.techinasia.com/tumblr-blocked-censored-china.
123. ↑ "Kazakhstan | Astana blocks Tumblr for promoting terrorism, porn". April 12, 2016. http://www.intellinews.com/kazakhstan-blocks-tumblr-for-promoting-terrorism-porn-94928/.
124. ↑ "Current State of Internet Censorship in Iran - Research - ViewDNS.info". http://viewdns.info/research/current-state-of-internet-censorship-in-iran/.
125. ↑ Ho, Victoria (February 18, 2016). "Indonesia reverses Tumblr ban, for now". http://mashable.com/2016/02/18/indonesia-reverses-tumblr-ban#rP9KEpoyQZqh.
126. ↑ "Tumblr was removed from Apple's App Store over child pornography issues". The Verge. https://www.theverge.com/2018/11/20/18104366/tumblr-ios-app-child-pornography-removed-from-app-store.
127. ↑ "Tumblr's Child Porn Crackdown Ensnares Legit Blogs in Purge" (in en). PC Magazine. https://www.pcmag.com/news/365036/tumblr-purges-blogs-after-getting-delisted-from-app-store.
128. ↑ "NSFW artists speak out as their accounts are suddenly 'purged' on Tumblr" (in en-US). The Daily Dot. November 20, 2018. https://www.dailydot.com/irl/tumblr-nsfw-artists-purged-child-porn/.
129. ↑ Krishna, Rachael (December 4, 2018). "Tumblr Launched An Algorithm To Flag Porn And So Far It's Just Caused Chaos". https://www.buzzfeednews.com/article/krishrach/tumblr-porn-algorithm-ban.
130. ↑ Miller, Chance (December 13, 2018). "Tumblr for iOS returns to App Store after child pornography discovery, new ban on adult content". https://9to5mac.com/2018/12/13/tumblr-for-ios-returns-to-app-store/.
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135. ↑ "An Actual Witch Stole Human Bones From A Graveyard And Sparked An Online Witch War" (in en). October 31, 2016. https://www.vice.com/en/article/vb4m4a/boneghazi-how-a-grave-robbing-controversy-tore-an-online-witch-community-apart.
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* Slidely
* Snapchat
* SNOW
* Spaces
* Streetlife
* StudiVZ
* Swarm
* Tagged
* Taringa!
* Tea Party Community
* TikTok
* Tinder
* Tout
* Tuenti
* TV Time
* Tumblr
* Twitter
* Untappd
* Vero
* VK
* Whisper
* Xanga
* Yo

Professional|

* Academia.edu
* Brainly
* BranchOut
* Edmodo
* IBM Connections
* LinkedIn
* Moodle
* ResearchGate
* Sciencescape (Metaα)
* Solaborate
* Viadeo
* XING
* IdeaPlane
* Yammer

Defunct|

* App.net
* Avatars United
* Bebo
* Bolt
* Capazoo
* eConozco
* Emojli
* eWorld
* Eyegroove
* FitFinder
* Formspring
* FriendFeed
* Friends Reunited
* Friendster
* Grono.net
* Google+
* Google Buzz
* Heello
* Hyves
* iTunes Ping
* iWiW
* Jaiku
* LunarStorm
* Me2day
* Meerkat
* Mobli
* Mugshot
* Multiply
* Musical.ly
* Natter Social Network
* Netlog
* Orkut
* Pheed
* Piczo
* PlanetAll
* Posterous
* Pownce
* Qaiku
* SixDegrees.com
* So.cl
* Spring.me
* Surfbook
* tbh
* Tribe.net
* Tsū
* tvtag
* Vine
* Windows Live Spaces
* Wretch
* Yahoo! 360°
* Yahoo! Kickstart
* Yahoo! Mash
* Yahoo! Meme
* Yik Yak

Services|

* Software comparison
* White-label
* Ning
* Wall.fm

Tools|

* Social network analysis software
* Diaspora (software)
* Web 2.0 Suicide Machine

Concepts|

* Online identity
* User profile
* Virtual community
* 1+ million users
* Small-world experiment
* Small-world network
* Social network
* Cybersectarianism

Applications|

* Social network advertising
* Social network hosting service
* Online dating service (comparison)
* Mobile

User interface|

* Activity stream
* Brand page
* Like button
* Hashtag
* Groups
* Reblogging
* Polling
* Online petitions

Implications|

* Privacy issues
* User gender difference
* Use in investigations

Protocols|

* ActivityPub
* Distributed Social Networking Protocol (defunct)
* Micropub
* OpenSocial (defunct)
* OStatus
* Pump.io
* XMPP

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Original source: https://en.wikipedia.org/wiki/Tumblr. Read more

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