Skype user directory data used to ID BitTorrent file sharers

Fair warning: If you share files illegally, on a P2P network like BitTorrent, and happen to have a Skype account as well, you may not be as anonymous as you think. Researchers have been able to determine the IP address of a Skype user, and link it to P2P activity. Researchers collected info users publish in Skype's directory to help them pinpoint their targets. Article