Tumblr
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Screenshot
The Tumblr login/sign up page; a different background image is displayed each time the page is loaded.
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| Type of business | Subsidiary |
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| Founded | February 19, 2007 |
| Headquarters | New York City |
| Founder(s) | David Karp |
| Industry | Microblogging, social networking service |
| Employees | 402 (as of February 2017) |
| Parent | Yahoo! (2013–present) |
| Website | tumblr |
| Alexa rank |
 36 (February 2017[update]) |
Tumblr is a microblogging and social networking website founded by David Karp in 2007, and owned by Yahoo! since 2013. The service allows users to post multimedia and other content to a short-form blog. Users can follow other users' blogs. Bloggers can also make their blogs private. For bloggers, many of the website's features are accessed from a "dashboard" interface.
As of February 1, 2017, Tumblr hosts over 334.1 million blogs. As of January 2016, the website had 555 million monthly visitors.
Development of Tumblr began in 2006 during a two-week gap between contracts at David Karp's software consulting company, Davidville (housed at Karp's former internship with producer/incubator Fred Seibert's Frederator Studios which was located a block from Tumblr's current headquarters). Karp had been interested in tumblelogs (short-form blogs) for some time and was waiting for one of the established blogging platforms to introduce their own tumblelogging platform. As no one had done so after a year of waiting, Karp and developer Marco Arment began working on their own tumblelogging platform. Tumblr was launched in February 2007 and within two weeks, the service had gained 75,000 users. Arment left the company in September 2010 to focus on Instapaper.
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.
On May 20, 2013, it was announced that Yahoo! and Tumblr had reached an agreement for Yahoo! to acquire Tumblr for $1.1 billion in cash. Many of Tumblr's users were unhappy with the news, causing some to start a petition, achieving nearly 170,000 signatures. David Karp remained CEO and the deal was finalized on June 20, 2013.
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