Tumblr

Tumblr is a social networking site that allows users to share pictures, links, videos, memes, stories, and much more. Originally founded by David Karp in 2007, Tumblr is now owned by Yahoo! Inc. In May of 2013, Yahoo! reported that Tumblr has approximately 300 million monthly users, and this number continues to grow each day.<ref name=businessinsider>http://www.businessinsider.com/tumblrs-active-users-lighter-than-expected-2013-5>

History

In 2006, David Karp and developer Marco Arment created Tumblr. Karp had always had in interest in blogging, specifically in microblogging, which is a more concise form of blogging. He hoped that Tumblr would function as an outlet for other microblogging enthusiasts. Tumblr gained instant popularity with over 75,000 users within the first two weeks. In September of 2010, Marco Arment left Tumblr to create Instapaper.[1] Karp continues to develop the site to better suit new users.