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Tumblr, Inc.
FoundedFebruary 2007[1]
HeadquartersNew York City, United States[2]
Key peopleDavid Karp (Founder, CEO)
IndustrySocial networking service, microblogging
Employees104 (as of August 2012)[1]
Alexa rankSteady 36 (October 2012)[3]
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Tumblr, Inc.
FoundedFebruary 2007[1]
HeadquartersNew York City, United States[2]
Key peopleDavid Karp (Founder, CEO)
IndustrySocial networking service, microblogging
Employees104 (as of August 2012)[1]
Alexa rankSteady 36 (October 2012)[3]

Tumblr, stylized as tumblr., is a microblogging platform and social networking website, owned and operated by Tumblr, Inc. The service allows users to post multimedia and other content to a short-form blog. Users can follow other users' blogs, as well as make their blogs private.[4][5] Much of the website's features are accessed from the "dashboard" interface, where the option to post content and posts of followed blogs appear.

As of July 18, 2012, Tumblr has over 64.7 million blogs.[2] According to comScore, it scored 13.4 million unique visitors in the United States alone in July 2011—up 218% from July 2010.[6] Its headquarters is located in Midtown Manhattan, New York City.[2]



Founder and CEO, David Karp

Tumblr was launched on April 27, 2007 by David Karp.[7] Marco Arment served as the lead developer, though he left the company in 2010 to focus on Instapaper.[8][9][10] Within two weeks of its launch, the service had gained 75,000 users.[11]

With Tumblr's 2009 acquisition of Tumblerette, an Apple Inc. App Store application created by Jeff Rock and Garrett Ross, the service launched its official iPhone app.[12][13] The site became available to BlackBerry smartphones on April 17, 2010 via a Mobelux application in the BlackBerry App World. In June 2012, Tumblr released a new version of its iOS app, Tumblr 3.0 allowing support for Spotify, hi-res images and offline access.[14]

In early June 2012, Tumblr featured its first major brand advertising campaign in conjunction with Adidas. Adidas launched an official soccer Tumblr blog and bought placements on the user dashboard. This launch was only two months after Tumblr announced it would be moving towards paid advertising on its site.[15]


As of August 20, 2012, Tumblr has over 69.4 million blogs and more than 29.8 billion total posts.[2] As of September 2011, the website receives more than 13 billion views per month.[16] As of July 2010, the site receives 25,000 new users each day[17] and as of July 2012, 71.6 million posts are created on the site each day.[1] An analysis by AddThis of shares through their service in 2011 noted that Tumblr sharing had increased by 1299.5%.[18]

The service is most popular with the teen and college-aged user segments with half of Tumblr's visitor base being under the age of 25.[19] As of 2009, Tumblr had an 85% retention rate,[20] compared with 40% for Twitter.[21]


Tumblr's original funding came from Karp's earnings as a software consultant at parenting site UrbanBaby. Tumblr has raised funding from Union Square Ventures, Spark Capital, Martín Varsavsky, John Borthwick (Betaworks), Fred Seibert, and Sequoia Capital (among other investors).[22][23] Tumblr shares two lead investors with Twitter. President and COO John Maloney was the founder of UrbanBaby with wife Susan Maloney.

The company had a $800 million valuation in August 2011.[24] In September 2011, the company raised $85 million in a round of funding led by Greylock Partners and Insight Venture Partners.[16]


See also


  1. ^ a b c "Press Information". Tumblr. http://www.tumblr.com/press. Retrieved July 18, 2012. 
  2. ^ a b c d Tumblr "About Us". http://www.tumblr.com/about Tumblr. Retrieved July 18, 2012. 
  3. ^ "Tumblr.com Site Info". Alexa Internet. http://www.alexa.com/siteinfo/tumblr.com. Retrieved 2012-08-30. 
  4. ^ Boutin, Paul (2009-03-13). "Tumblr Makes Blogging Blissfully Easy". The New York Times. http://gadgetwise.blogs.nytimes.com/2009/03/13/tumblr-makes-blogging-blissfully-easy/. Retrieved 2009-03-26. 
  5. ^ "These 19 Social Networks Are Bigger Than Google+". Business Insider. http://www.businessinsider.com/these-19-social-networks-are-still-bigger-than-google-2011-7#13-deviantart-an-online-community-for-artists-to-share-and-display-their-work-384-million-7. 
  6. ^ Van Grove, Jennifer (August 31, 2011). "Tumblr Tops 13 Million U.S. Uniques in July". Mashable. http://mashable.com/2011/08/31/tumblr-record-uniques/. Retrieved December 24, 2011. 
  7. ^ Karp, Dave (April 27, 2007). "I'm SO thrilled with the Tumblr launch. Time to get dinner!". David's Log. Archived from the original on February 13, 2012. http://www.davidslog.com/1299486/im-so-thrilled-with-the-tumblr-launch-time-to. Retrieved April 18, 2012. 
  8. ^ Kushner, David. "David Karp is the Barely Legal Blogfather". http://www.maxim.com/humor/articles/57088/davidkarpisthebarelylegalblogfather.html. Retrieved 2009-04-13. 
  9. ^ Shafrir, Doree. "Would You Take a Tumblr With This Man?". http://www.observer.com/2008/would-you-take-tumblr-man. Retrieved 2009-03-23. 
  10. ^ "Marco Arment Leaves Tumblr To Work On Instapaper". TechCrunch. 2010-09-21. http://techcrunch.com/2010/09/21/marco-arment-instapaper/. Retrieved 2010-12-14. 
  11. ^ Ingram, Mathew (August 25, 2010). "Google VC, Tumblr CEO Among the Top Innovators Under 35". GigaOM. Archived from the original on January 6, 2012. http://gigaom.com/2010/08/25/google-vc-tumblr-ceo-among-the-top-innovators-under-35/. Retrieved January 6, 2012. 
  12. ^ Van Grove, Jennifer (2009-02-25). "Tumblr Rebrands Tumblerette and Releases Free iPhone App". http://mashable.com/2009/02/25/tumblr-iphone-app/. Retrieved 2011-03-22. 
  13. ^ "Tumblerette is now the official Tumblr iPhone App! (and it’s free!)". 2009-02-25. http://staff.tumblr.com/post/81463386/iphone-app. Retrieved 2011-03-22. 
  14. ^ Perez, Sarah (June 21, 2012). "Better, Stronger, Faster: Tumblr 3.0 For iPhone Has Arrived". TechCrunch. Archived from the original on July 18, 2012. http://techcrunch.com/2012/06/21/better-stronger-faster-tumblr-3-0-for-iphone-has-arrived/. Retrieved July 18, 2012. 
  15. ^ Delo, Cotton (June 8, 2012). "Tumblr Unveils First Major Brand Campaign for Adidas". Advertising Age. Crain Communications. Archived from the original on July 18, 2012. http://adage.com/article/digital/tumblr-unveils-major-brand-campaign-adidas/235262/. Retrieved July 18, 2012. 
  16. ^ a b Ludwig, Sean (September 26, 2011). "Tumblr grabs another $85M in fresh funding". VentureBeat. Archived from the original on January 6, 2012. http://venturebeat.com/2011/09/26/tumblr-raises-85m-greylock/. Retrieved January 6, 2012. 
  17. ^ Siegler, MG (July 19, 2010). "Tumblr Is On Fire. Now Over 6 Million Users, 1.5 Billion Pageviews A Month". TechCrunch. Archived from the original on January 6, 2012. http://techcrunch.com/2010/07/19/tumblr-stats/. Retrieved January 6, 2012. 
  18. ^ Dumenco, Simon (December 13, 2011). "AddThis: Facebook Makes Up 52% of Sharing on the Web". AdAge. Archived from the original on December 15, 2011. http://adage.com/article/the-media-guy/facebook-makes-52-sharing-web/231528/. Retrieved December 15, 2011. 
  19. ^ Lipsman, Andrew (August 30, 2011). "Tumblr Defies its Name as User Growth Accelerates". comScore. Archived from the original on January 6, 2012. http://blog.comscore.com/2011/08/tumblr_user_growth_accelerates.html. Retrieved January 6, 2012. 
  20. ^ Dannen, Chris. "What the Hell is Tumblr? And other Worthwhile Questions". http://www.fastcompany.com/blog/chris-dannen/techwatch/what-hell-tumblr-and-other-worthwhile-questions. Retrieved 2009-06-25. 
  21. ^ Goldsmith, Belinda (April 29, 2009). "Many Twitters are quick quitters: study". Reuters (Thompson Reuters). http://www.reuters.com/article/deborahCohen/idUSTRE53S1A720090429. Retrieved 2009-04-29. 
  22. ^ "Best Young Tech Entrepreneurs 2009". http://images.businessweek.com/ss/09/04/0421_best_young_entrepreneurs/11.htm. Retrieved 2009-06-25. 
  23. ^ Anthony Ha, VentureBeat. "Blog startup Tumblr goes bi-coastal with Sequoia Investment." November 12, 2010.
  24. ^ Ludwig, Sean (August 26, 2011). "Tumblr on verge of raising up to $100M with massive $800M valuation". VentureBeat. Archived from the original on January 6, 2012. http://venturebeat.com/2011/08/26/tumblr-on-verge-of-raising-up-to-100m-with-massive-800m-valuation/. Retrieved January 6, 2012. 
  25. ^ "Best Young Tech Entrepreneurs 2009: Tumblr". Bloomberg Businessweek. http://images.businessweek.com/ss/09/04/0421_best_young_entrepreneurs/11.htm. Retrieved December 24, 2011. 
  26. ^ "New York City Hot 125". Lead411.com. http://www.lead411.com/topnewyorkcompanies.html. Retrieved December 24, 2011. 
  27. ^ a b c Hickman, Angela (August 9, 2011). "The Top 10 celebrities on Tumblr". National Post. Archived from the original on January 6, 2012. http://arts.nationalpost.com/2011/08/09/the-top-10-celebrities-on-tumblr/. Retrieved January 6, 2012. 
  28. ^ "Behind the Occupy Wall Street slogan ‘We Are the 99%’". The Washington Independent. September 29, 2011. http://washingtonindependent.com/112752/behind-the-occupy-wall-street-slogan-we-are-the-99. Retrieved December 24, 2011. 
  29. ^ Kain, E.D. (October 12, 2011). "Outside of Wonkland, 'We are the 99%' Is a Pretty Good Slogan". Forbes. http://www.forbes.com/sites/erikkain/2011/10/12/outside-of-wonkland-we-are-the-99-is-a-pretty-good-slogan/. Retrieved December 24, 2011. 
  30. ^ Bilton, Nick (October 24, 2011). "Obama Campaign Experiments With Tumblr for '12". New York Times. http://bits.blogs.nytimes.com/2011/10/24/obama-campaign-experiments-with-tumblr-for-12/. 

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