The document discusses the history and features of wikis and social networks. It defines wikis as websites that allow users to easily create and edit web pages and links between pages, with Wikipedia and WikiHow given as examples. The first wiki was WikiWikiWeb in 1995. Wikis offer advantages like easy information sharing but also disadvantages like potential for vandalism since edits are open. Social networks emerged in 1995 and let users create online communities, with examples like MySpace and Bebo, but also pose privacy and security risks to users.