I literally get so many messages like this that a dear friend of mine has offered to help me start a separate website just to share the interactions. If I'm going to be harassed, I might as well monetize it, right? This one came today. The pattern is this: I get a friend request from someone with whom I have no mutual friends. I send them a message that is something like, "Do I know you?" and it goes from there. I take screen shots and publicly humiliate these men as often as possible.