Tumblr is an American microblogging and social networking website founded by David Karp in 2007 that allows users to post multimedia content and follow other users' blogs. Users can make their blogs private or public. The document outlines a 5 phase process for signing up for and using Tumblr, including signing up, exploring options, creating a multimedia blog, customizing settings, and visiting the site. It concludes by thanking the reader and stating "Jai Bharat!"