"Social media describes the online technologies and practices that people use to share opinions, insights, experiences, and perspectives. Social media can take many different forms, including text, images, audio, and video. These sites typically use technologies such as blogs, message boards, podcasts, wikis, and vlogs to allow users to interact." (Wikipedia)
The UMBC ebqiuty group as a number of project that involve one or more aspects of social media, inlcuing online games, weblog spam detection, blog community identification, and influence modeling.