Otherwise known as a "Stalking Creeper". Typically seen on popular
social networking sites, and defined as one who; even though never contacts you directly, always seems to know what you have going on at that
particular time, who you're talking to, where you're going to be
hanging out, etc. Then, either "happens" to show up in these particular places at these particular times, or "somehow" starts attempting to pop up on all your friends pages.
stalker creep creeper lurker