By way of Schneier's blog comes this article
looking at a report about data mining in online games, looking for "suspicious behaviour":
The cultural and behavioral norms of virtual worlds and gaming are generally unstudied. Therefore, Reynard will seek to identify the emerging social, behavioral and cultural norms in virtual worlds and gaming environments. The project would then apply the lessons learned to determine the feasibility of automatically detecting suspicious behavior and actions in the virtual world.
The research will use publicly available data and will begin with observational studies to establish baseline normative behaviors.
Normative behaviours in online games? Prepare to be a suspect.