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The team then figured out the math to identify 95 percent of the phone-users from just four randomly selected data points. Given 11 data points, they could identify all of the users. The danger of being able to identify cellphone users so easily is that you could deduce some pretty private information just from where people go. You could see if someone attends certain religious or political meetings, visits an HIV/AIDS or reproductive clinic, or hangs out with an ex or a business rival.