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Staying Off Facebook Won't Protect Your Privacy
Stay away from social networks and people won't know who you're hanging out with or what you're doing, right? Wrong. When it comes to social networking, a recent study suggests, you can run but you can't hide.
A paper published last month in the journal PLoS One shows how researchers were able to learn about nonmembers of social networks based on information their friends posted online. Using machine-learning models, German researchers Emöke-Ágnes Horvát, Michael Hanselmann, Fred A. Hamprecht and Katharina A. Zweig were able to predict whether two nonmembers of a social network knew each other based on information shared by a mutual contact on the network.