Tumblr is a microblogging platform and social networking website, owned and operated by Tumblr, Inc. Emphasizing its ease of use, the service allows users to post 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 February 19, 2012, Tumblr had over 45.1 million blogs and more than 17 billion total posts. As of September 2011, the website receives more than 13 billion views per month.[15] As of July 2010, the site receives 25,000 new users each day and as of September 2011, 40 million posts are created on the site each day. An analysis by AddThis of shares through their service in 2011 noted that Tumblr sharing had increased by 1299.5%.
The service is most popular with the teen and college-aged user segments; fifty percent of Tumblr's visitor base is under the age of 25. As of 2009, Tumblr had an 85% retention rate, compared with 40% for Twitter.
