The document discusses the evolution and classification of social media. It traces the origins of social media back to early technologies like CompuServe and AOL in the 1960s and 1970s, then outlines the development of major social media platforms from the 1990s to today, including Google, Blogger, Wikipedia, Myspace, LinkedIn, Skype, Facebook, Twitter, YouTube, and Tumblr. It then broadly classifies social media into six categories: collaborative projects, blogs and microblogs, content communities, social networking sites, virtual game worlds, and virtual social worlds. The document suggests social media can be used to create buzz, bring revolutions, drive home messages, and spread hashtags promoting political slogans.