Thomas Ryan of Provide Security's making it public knowledge that social networking sites aren't just annoying: they're also potentially major security threats. Ryan set up a fake Facebook, LinkedIn and Twitter account for "Robin Sage," a person who doesn't exist and never has -- but we can assure you she's really, really hot. Robin billed herself as a graduate of MIT and a prestigious New Hampshire prep school, and quickly made hundreds of connections across all three sites, without ever offering any proof of her existence or the connections she espoused. Even more stunning, "Robin" was befriending military, government and intel people on Facebook and Linked In (where she dubbed herself a "hacker"), and hackers on Twitter. Ryan's findings state that the military and intel "friends" Robin made freely share information and documents with her, as well as inviting her to various conferences. Interestingly, it turns out the only group that was in anyway resistant to Robin were the MIT -associated people... but we knew they were all whip-smart already. Moral? Next time you accept the request of a beautiful, intelligent hacker who wants to come over and view your secret dossiers, you should probably think twice.