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, named a "tumblelog". Users can follow other users' blogs, as well as make their blogs private. 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 June 8, 2012, Tumblr has over 58.9 million blogs. According to comScore, it scored 13.4 million unique visitors in the United States alone in July 2011—up 218% from July 2010. Its headquarters is located in Midtown Manhattan, New York City.
Tumblr was launched on April 27, 2007 by David Karp. Marco Arment served as the lead developer, though he left the company in 2010 to focus on Instapaper. Within two weeks of its launch, the service had gained 75,000 users.
With Tumblr's 2009 acquisition of Tumblerette, an Apple Inc. App Store application created by Jeff Rock...
