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I can't find the article through surface level searching, but I remember reading something that showed that this is already the case. Using Apple's Find My Friends App, a wife found out her spouse was cheating on her. He had forgotten about the app, and it revealed that he was at the woman's house. I just try to steer clear from location-based apps. Except for Ingress...that game is so cool, especially for an on-the-go Campus Kid like me.