This is dumb. You can get a private investigator to do this for $100 - $200, with almost surely a better method that Phil used. Given what Phil does, the most

This is dumb. You can get a private investigator to do this for $100 - $200, with almost surely a better method that Phil used. Given what Phil does, the most cost effective (rational) method he could have used was to spend those hours working, and then pay a private investigator. If he wanted to do it himself, the easiest way is to facebook search for people who went to her high school in the right date range, then ask them who is in the photo. Given the start time and end time, Phil probably didn't do that, he probably browsed their photos & friends until he found her. Not a very good use of time, but it would work. I think guessing the exact method used isn't interesting, because the problem isn't a particularly hard one. He's done the social engineering equivalent of picking the lock on your filing cabinet.