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Simply joining a few groups at social networking sites may reveal enough information for hackers to personally identify you, according to some recent computer science research. In a paper that will be presented at a security conference later this year, an international team of academics describes how they were able to build membership sets using information that social networking sites make available to the public, and then leverage an existing attack on browsing history to check for personal identity. That information, they argue, can then be combined with other data to create further security risks, such as a personalized phishing attack.