Researchers ID Skype users who also use BitTorrent

A team of international researchers led by the Polytechnic Institute of New York University has detected flaws in Skype that puts the privacy of hundreds of millions of users at risk, they say. 

The research shows that even when Skype users block callers, allow only calls from their contact list, and connect from behind a firewall, hackers can plumb their identities. The researchers confirmed that intruders can use Skype to discover which files call recipients are sharing, and track their whereabouts, too. The information can be collected without the Skype user even knowing that he or she has been contacted (and is at risk of exploitation).