This document provides an overview of social media and discusses various forms of social media including social news sites, social networking sites, social sharing sites, social bookmarking sites, wikis, and microblogging. It defines social media as interactive online platforms that allow people to share information, opinions, and insights. Various popular social media sites are mentioned for each form, with Twitter being highlighted as a microblogging and social networking site. The document also briefly discusses why microblogging has become a convenient alternative to conventional blogging.