If you only give them fake info, then they won't know anything about, since Tor takes care of hiding your IP address and physical location. My answer above was based on the assumption that that's what OP wanted to do. However, I suppose Facebook could infer things about you from your friends, if they use real information. If they are all located in one city, there's a good chance you are too. Also, apparently there was a time when Facebook would ask people if their friends' info was accurate. I don't believe they do that anymore since the media picked it up as "snitching on your friends". Then again, if your friends are snitching on you to Facebook, you probably need better friends.