Readers of the blog might know that I have an interest in segregation and the use of agent-based models to explore such phenomena. There are many types of segregation, for example, by race, income, social class etc. Research commissioned by More4 News shows that social networks sites such as Facebook, Bebo and MySpace are respectively attracting specific social groups, of certain ages, living in different areas thus resulting in segregated social networks. Below is a movie, and if you what closely you will see Schelling's model of segregation, which Andrew Hudson-Smith uses to explain how such online segregation might occur.
Further information about the research including the poll results used in the news report can be found here.