Social Media:
Social media describes the online technologies and practices that people use to share opinions, insights, experiences, and perspectives with each other.
Social media can take many different forms, including text, images, audio, and video. Popular social mediums include blogs, message boards, podcasts, wikis, and vlogs.
A few prominent examples of social media applications are Wikipedia (reference), MySpace (social networking), Gather.com (social networking),YouTube (video sharing), Second Life (virtual reality), Digg (news sharing), Flickr (photo sharing) and Miniclip (game sharing). These sites typically use technologies such as blogs, message boards, podcasts, wikis, and vlogs to allow users to interact.
source: wikipedia
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