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How Facebook can have your data even if you're not on Facebook

One of the creepiest things brought to light during Mark Zuckerberg’s testimony on Capitol Hill this week was how Facebook can amass data to construct what are being referred to as “shadow profiles” of you, even if you’ve never opted in or joined the world’s largest social network. Facebook’s CEO told Congressman Ben Lujan, D-N.M., that he was unfamiliar with shadow profiles as a term but acknowledged that “in general,” Facebook collects information on people who have not signed up for the service, which it does for “security purposes.” But privacy advocates worry about what happens to that data when it is in Facebook’s control and not yours, or for that matter slips out of the company’s grasp. Facebook may have pr ...