Don’t worry: I’m not going to tell you not to post pictures of yourself drunk or exposed on Facebook because future employers might look at your profile, or tell you not to write about how "totally wasted” you got last night on your Wall because, again, prospective employers might read it. There are other articles you can read on that, and I do suggest considering the advice given in those articles. What I want to talk about is the other side of Facebook, the side that allows creeps to spy on you.