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| company_type = [[Subsidiary]]
| foundation = {{start date and age|2007|02|}}<ref name="press" />
| location = [[NewSan York CityFrancisco]], U.S.
| founder = [[David Karp]]
| industry = [[Microblogging]], [[social networking service]]
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| screenshot = TumblrHomepage.jpg
| screenshot_size = 225px
| caption = The Tumblr login/signhomepage, up page;showing a different background image is displayed each time the page is loadedfeed.
| key_people = [[Matt Mullenweg]] (CEO)<ref name="wordpressbought">{{cite web|url=https://www.theverge.com/2019/8/12/20802639/tumblr-verizon-sold-wordpress-blogging-yahoo-adult-content|title=Verizon is selling Tumblr to WordPress' owner|last=Alexander|first=Julia|date=August 12, 2019|website=The Verge|access-date=August 13, 2019|archive-date=August 13, 2019|archive-url=https://web.archive.org/web/20190813023727/https://www.theverge.com/2019/8/12/20802639/tumblr-verizon-sold-wordpress-blogging-yahoo-adult-content|url-status=live}}</ref>
}}'''Tumblr''' (pronounced "tumbler") is a [[microblogging]] and [[Social networking service|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]].
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|footer= 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.<ref>{{cite AV media |last1 = Karp |first1 = David |last2 = Alexandria |first2 = Julie |date = May 27, 2008 |title = David Karp and Tumblr |type = Video |url = https://www.youtube.com/watch?v=DK4pLXWkgMw |access-date = February 24, 2013 |time = 1:30 |publisher = [[Wallstrip]] |quote = 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. |archive-date = August 15, 2013 |archive-url = https://web.archive.org/web/20130815015120/http://www.youtube.com/watch?v=DK4pLXWkgMw |url-status = live }}</ref><ref>{{cite magazine |url=https://www.forbes.com/sites/jeffbercovici/2013/01/02/tumblr-david-karps-800-million-art-project/2/ |title="Tumblr: David Karp's $800 Million Art Project" Forbes, January 2, 2013 |magazine=Forbes.com |date=April 18, 2012 |access-date=April 17, 2013 |archive-date=April 27, 2017 |archive-url=https://web.archive.org/web/20170427004737/https://www.forbes.com/sites/jeffbercovici/2013/01/02/tumblr-david-karps-800-million-art-project/2/ |url-status=live }}</ref> Karp had been interested in [[microblogging|tumblelogs]] (short-form blogs, hence the name Tumblr)<ref>{{Cite web|url=https://www.rewindandcapture.com/why-is-tumblr-called-tumblr/|title=Why Is Tumblr Called Tumblr? &#124; Rewind & Capture|first=Lauren|last=Cosgrove|date=June 29, 2015 |access-date=March 31, 2020|archive-date=August 9, 2020|archive-url=https://web.archive.org/web/20200809155252/https://www.rewindandcapture.com/why-is-tumblr-called-tumblr/|url-status=live}}</ref> 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.<ref name="mediabistro">{{cite web |title = So What Do You Do, David Karp, Founder of Tumblr? |first = Sammy |last = Davis |url = http://www.mediabistro.com/So-What-Do-You-Do-David-Karp-Founder-of-Tumblr-a10281.html |work = [[Mediabistro.com]] |date = August 27, 2008 |access-date = January 2, 2013 |archive-url = https://web.archive.org/web/20130119110211/http://www.mediabistro.com/So-What-Do-You-Do-David-Karp-Founder-of-Tumblr-a10281.html |archive-date = January 19, 2013 |url-status = dead |df = mdy-all }}</ref><ref name="shafrir">{{cite news |title = Would You Take a Tumblr With This Man? |first = Doree |last = Shafrir |author-link = Doree Shafrir |url = http://observer.com/2008/01/would-you-take-a-tumblr-with-this-man/?show=all |newspaper = [[The New York Observer]] |date = January 15, 2008 |access-date = January 2, 2013 |archive-url = https://web.archive.org/web/20130121084613/http://observer.com/2008/01/would-you-take-a-tumblr-with-this-man/?show=all |archive-date = January 21, 2013 |url-status = live |df = mdy-all }}</ref> Tumblr was launched in February 2007,<ref name="fastcompany">{{cite AV media |last1 = Karp |first1 = David |date = December 12, 2011 |title = David Karp: When It All Came Together |type = Video |url = https://www.youtube.com/watch?v=gHU1pSHAisE |access-date = February 24, 2013 |time = 1:03 |publisher = [[Fast Company (magazine)|Fast Company]] |quote = Over the next few months, we kind of pieced together what became the first version of Tumblr which launched in February 2007. |archive-date = July 29, 2013 |archive-url = https://web.archive.org/web/20130729042705/http://www.youtube.com/watch?v=gHU1pSHAisE |url-status = live }}</ref><ref>{{cite web |title = Tumblr – something we've always wanted |first = David |last = Karp |url = https://davidville.wordpress.com/2007/02/19/tumblr/ |work = Davidville |date = February 19, 2007 |access-date = February 24, 2013 |archive-url = https://web.archive.org/web/20130213010619/http://davidville.wordpress.com/2007/02/19/tumblr/ |archive-date = February 13, 2013 |url-status = live |df = mdy-all }}</ref> and within two weeks had gained 75,000 users.<ref name="gigaom">{{cite web |title = Google VC, Tumblr CEO Among the Top Innovators Under 35 |first = Matthew |last = Ingram |url = http://gigaom.com/2010/08/25/google-vc-tumblr-ceo-among-the-top-innovators-under-35/ |work = [[GigaOM]] |publisher = Giga Omni Media |date = August 25, 2010 |access-date = January 2, 2013 |archive-url = https://web.archive.org/web/20130122032930/http://gigaom.com/2010/08/25/google-vc-tumblr-ceo-among-the-top-innovators-under-35/ |archive-date = January 22, 2013 |url-status = live |df = mdy-all }}</ref> Arment left the company in September 2010 to work on [[Instapaper]].<ref name="arment">{{cite web |title = Tumblr CTO Steps Down To Focus on Instapaper, Independent Career |first = Dan |last = Frommer |url = http://www.businessinsider.com/tumblr-cto-steps-down-to-focus-on-instapaper-independent-career-2010-9 |work = [[Business Insider]] |date = September 21, 2010 |access-date = February 24, 2013 |archive-date = September 21, 2015 |archive-url = https://web.archive.org/web/20150921193635/http://www.businessinsider.com/tumblr-cto-steps-down-to-focus-on-instapaper-independent-career-2010-9 |url-status = live }}</ref>
 
In June 2012, Tumblr featured its first major brand [[advertising campaign]] in collaboration with [[Adidas]], who launched an official [[Soccer in the United States|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.<ref>{{cite web |title = Tumblr Unveils First Major Brand Campaign for Adidas |first = Cotton |last = Delo |url = http://adage.com/article/digital/tumblr-unveils-major-brand-campaign-adidas/235262/ |work = [[Advertising Age]] |publisher = [[Crain Communications]] |date = June 8, 2012 |access-date = July 18, 2012 |archive-url = https://web.archive.org/web/20120720102139/http://adage.com/article/digital/tumblr-unveils-major-brand-campaign-adidas/235262/ |archive-date = July 20, 2012 |url-status = live |df = mdy-all }}</ref>
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In November 2022, Mullenweg stated that Tumblr will add support for the decentralized social networking protocol [[ActivityPub]].<ref>{{Cite web |last=Perez |first=Sarah |date=2022-11-21 |title=Tumblr to add support for ActivityPub, the social protocol powering Mastodon and other apps |url=https://techcrunch.com/2022/11/21/tumblr-to-add-support-for-activitypub-the-social-protocol-powering-mastodon-and-other-apps/ |access-date=2022-12-05 |website=[[TechCrunch]] |archive-date=December 5, 2022 |archive-url=https://web.archive.org/web/20221205222023/https://techcrunch.com/2022/11/21/tumblr-to-add-support-for-activitypub-the-social-protocol-powering-mastodon-and-other-apps/ |url-status=live }}</ref> 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.<ref>{{Cite web |last=Robertson |first=Adi |date=2023-11-09 |title=Tumblr is downscaling after failing to 'turn around' the site |url=https://www.theverge.com/2023/11/9/23954412/tumblr-downscaling-employees-transferred-automattic |access-date=2023-11-11 |website=The Verge |language=en}}</ref>
 
In February 2024, Automattic announced that it would begin selling user data from Tumblr and WordPress.com to [[Midjourney]] and [[OpenAI]]. Tumblr users are opted-in by default, with an option to opt out.<ref>{{Cite web |last=Cole |first=Samantha |date=2024-02-27 |title=Tumblr and WordPress to Sell Users' Data to Train AI Tools |url=https://www.404media.co/tumblr-and-wordpress-to-sell-users-data-to-train-ai-tools/ |access-date=2024-02-28 |website=404 Media |language=en}}</ref><ref>{{Cite web |date=2024-02-27|title=Staff |url=https://staff.tumblr.com/post/743510217982083072/hi-tumblr-its-tumblr-were-working-on-some |access-date=2024-02-28 |website=Tumblr |language=en-US}}</ref>
 
In August 2024, Automattic announced that it would migrate Tumblr's backend to an architecture derived from WordPress, in order to ease development and code sharing between the platforms. The company stated that this migration would not impact the service's user experience and content, and that users "won't even notice a difference from the outside".<ref>{{Cite web |last=Perez |first=Sarah |date=2024-08-28 |title=Tumblr to move its half a billion blogs to WordPress |url=https://techcrunch.com/2024/08/28/tumblr-to-move-its-half-a-billion-blogs-to-wordpress/?guccounter=1&guce_referrer=aHR0cHM6Ly9zbGFzaGRvdC5vcmcv&guce_referrer_sig=AQAAAM0tA_unomvNB4s2nbvt7IA4y-JYtDNIWAEKH7CJT0dS6TKhFS_xapzK__LrC8nPzIXLUWPLzc8Jbz3H_UeMrXvorP3q9N04LM3GinNUGk9LsKLOxKO6nAeju2hz6py3b_uGLc7-78iACKaoNQTinE7SvBwqoavdmmfmhCazXxmr |access-date=2024-08-28 |website=TechCrunch |language=en-US}}</ref>
 
==Features==
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* '''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.<ref name="Tumblr Help: Posts"/>
* '''Tags''': Users can help their audience find posts about certain topics by adding [[Hashtag|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 themes are able to be shared and used by other users, or sold.
* '''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.<ref>{{Cite web |title=Legacy Domains - Tumblr Support |url=https://help.tumblr.com/hc/en-us/articles/231256548-Legacy-Domains }}</ref><ref>{{Cite web |last=staff |date=2023-06-20 |title=Tumblr Domains: That thing you do in the place they already know |url=https://staff.tumblr.com/post/720657694645714944/tumblr-domains-that-thing-you-do-in-the-place |access-date=2023-10-15 |website=Tumblr}}</ref>
 
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=== Copyright issues ===
Tumblr has received criticism for copyright violations by participating bloggers;<ref name=Supervision /> however, Tumblr accepts [[Digital Millennium Copyright Act]] (DMCA) [[OCILLA|take-down notices]].<ref name="tumblr dmca form">{{cite web | url=https://www.tumblr.com/dmca | title=DMCA Copyright Notifications | publisher=Tumblr | access-date=May 20, 2013 | archive-date=May 21, 2013 | archive-url=https://web.archive.org/web/20130521153714/https://www.tumblr.com/dmca | url-status=live }}</ref> Tumblr's visual appeal has made it ideal for photoblogs that often include copyrighted works from others that are re-published without payment.<ref name="Why Tumblr must kill">{{cite news|last=Edwards|first=Jim|title=Why Tumblr Must Kill What Made it Big: Porn and Copyright Violations|url=http://www.cbsnews.com/news/why-tumblr-must-kill-what-made-it-big-porn-and-copyright-violations|access-date=March 28, 2013|newspaper=CBSNews.com|date=September 12, 2011|archive-date=December 3, 2013|archive-url=https://web.archive.org/web/20131203092813/http://www.cbsnews.com/news/why-tumblr-must-kill-what-made-it-big-porn-and-copyright-violations/|url-status=live}}</ref> 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.<ref name=Supervision>{{cite web|last=Edwards|first=Jim|title=Why Tumblr Needs Adult Supervision Right Now|url=http://www.businessinsider.com/tumblr-fashion-directors-exit-could-mean-entry-of-adult-supervision-2011-11|website=Business Insider|access-date=January 27, 2014|archive-date=December 18, 2013|archive-url=https://web.archive.org/web/20131218001108/http://www.businessinsider.com/tumblr-fashion-directors-exit-could-mean-entry-of-adult-supervision-2011-11|url-status=live}}</ref><ref name=Criticism>{{cite web|title=Tumblr: A New Way of Blogging|url=https://sites.google.com/site/xwarneritessay/5|access-date=March 21, 2013|archive-date=May 9, 2013|archive-url=https://web.archive.org/web/20130509182754/https://sites.google.com/site/xwarneritessay/5|url-status=live}}</ref>
 
In addition to these copyright infringements, Tumblr has at times been weaponised by individuals seeking to raise DMCA notices against other sites. Former Wall Street Journalist and Pulitzer Prize-winning journalist Bradley Hope and his investigative publication Project Brazen published a story on 10 October 2023 reporting that Indian businessman Gaurav Srivastava was fraudlently representing himself as an agent of the [[Central Intelligence Agency]] ([[Gaurav Srivastava scandal|the Gaurav Srivastava Fake Spy Scam]]).<ref name=":2">{{Cite web |date=2024-01-18 |title=Fake Blogs Taken Down As Conman Gaurav Srivastava's Cover-Up Fails |url=https://thefridaytimes.com/18-Jan-2024/fake-blogs-taken-down-as-conman-gaurav-srivastava-s-cover-up-fails |access-date=2024-08-22 |website=The Friday Times |language=en}}</ref> Shortly after, a fake blog was created on blogging site Tumblr that republished the content of their story and backdated it to 8 October 2023, two days before their article came out. Following a copyright infringement complaint filed on legal archive Lumen and without checking the veracity of the source, [[Google]] delisted the Project Brazen article from its search results. Tumblr later confirmed that it had removed several accounts and posts from its platform following the alleged abuse of the site by Srivastava.<ref name=":2" />
 
=== Security ===
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=== 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 [[Suicide attempt|attempting suicide]] over their artwork, in which they drew characters thin that are typically seen as being 'fat' in the show.<ref>{{Cite web|url=https://www.vice.com/en_us/article/3da838/an-attempted-suicide-forced-a-tumblr-community-to-open-its-eyes-about-bullying|title=An Attempted Suicide Forced a Tumblr Community to Open Its Eyes About Bullying|last=Nguyen|first=Clinton|date=November 6, 2015|website=Vice|language=en|access-date=February 29, 2020|archive-date=February 22, 2020|archive-url=https://web.archive.org/web/20200222215926/https://www.vice.com/en_us/article/3da838/an-attempted-suicide-forced-a-tumblr-community-to-open-its-eyes-about-bullying|url-status=live}}</ref> 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 whichthat inhibited discussion and discourse.<ref>{{Cite web|url=https://kotaku.com/in-2018-tumblr-is-a-joyless-black-hole-1827294865|title=In 2018, Tumblr Is A Joyless Black Hole|website=Kotaku|date=July 2, 2018 |language=en-us|access-date=February 29, 2020|archive-date=January 13, 2020|archive-url=https://web.archive.org/web/20200113133050/https://kotaku.com/in-2018-tumblr-is-a-joyless-black-hole-1827294865|url-status=live}}</ref>
 
===Promotion of self-harm and suicide===