SOCIAL MEDIA HOME PAGE. Social media is an umbrella term that defines the various activities that integrate technology, social interaction, and the construction of words and pictures. This interaction, and the manner in which information is presented, depends on the varied perspectives and "building" of shared meaning, as people share their stories, and understandings.      Retrieved from Wikipedia, March 13, 2008. While you are in  Wikipedia, look at the examples of many social media apps at http://en.wikipedia.org/wiki/Social_media#Examples     Also. look at the references especially Surowiecki's The Wisdom of Crowds that you might checkout of your library to understand an underlying concept of social media.

Web 2.0. Web 2.0 is a trend in World Wide Web </wiki/World_Wide_Web> technology, and web design, a second generation of web-based communities and hosted services such as social-networking sites, wikis , blogs, and folksonomies, which aim to facilitate creativity, collaboration, and sharing among users. The term became notable after the first O'Reilly Media Web 2.0 conference in 2004 Although the term suggests a new version of the World Wide Web , it does not refer to an update to any technical specifications, but to changes in the ways software developers and end-users use webs.

MUVES (Multi-User Virtual Environments).