Finin, Tim, et al. "The information ecology of social media and online communities." AI Magazine 29.3 (2008): 77-77.

This text highlights the significant contribution of Web 2.0 sites such as sharing platforms, wikis, and online forums to new Web content, accounting for up to one-third of it. These sites are distinguished from traditional web pages by their integration with various forms of networked data, including social networks, comments, trackbacks, and tags. The text discusses recent efforts in developing systems that leverage models of the Blogosphere to tackle challenges like spam blog recognition, opinion mining, community identification, trust relationship derivation, and influential blogger detection.