Too often the public conversation about online vulnerability is about things like identity theft and credit card fraud,” Ben Wizner, director of the ACLU’s Speech, Privacy & Technology Project, told me. “For most people, though, credit card fraud actually has minimal impact. But what if there was a database that knew where your phone had been everyday between 3 a.m. and 5 a.m.? Functionally that database would be a proxy for who you were sleeping with. Well, there is that database, because you have a phone. There isn’t anybody out there who should feel smugly secure.