Tumblr was launched in 2007, founded by David Karp, and owned by Yahoo! Inc. Tumblr is a microblogging platform that allows users to share video, audio, words, social bookmarks, and photos with other people. The term of microblogging or blogging is not enough to define Tumblr. Tumblr is a good example of how the idea of blogging and of social networking can be embodied in an online platform. You can interact with other people by reblogging and liking, pull others to your blog by posting great content, and boost the number of followers you attract.