Founded by David Karp in 2007, Tumblr is a microblogging platform and social networking website that allows users to post multimedia and other content to a short-form blog.

Tumblr’s main features include a live feed of recent posts from Tumblrs a user follows, tags, HTML editing capabilities and the queue, which enables users to schedule posts.

Yahoo acquired Tumblr in June 2013, retaining Karp as CEO.