Tumblr

Tumblr is a microblogging and social networking website founded by David Karp in 2007, and owned by Oath Inc. 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 November 1, 2017, Tumblr hosts over 375.4 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). Tumblr was launched in February 2007, and within two weeks the service had gained 75,000 users.