cnet news:  “The next friend request you receive might come from the FBI.  The Obama administration has considered sending federal police undercover on social-networking sites, including Facebook, MySpace, and Twitter.  A confidential U.S. Department of Justice presentation (PDF) on social-networking sites made public Tuesday said online undercover work can help agents ‘communicate with suspects,’ ‘gain access to nonpublic info,’ and ‘map social relationships’.”  The DOJ presentation states, “Why go undercover on Facebook, MySpace, etc.,?  Communicate with suspects/targets.  Gain access to non-public info.  Map social relationships/networks.”