1. to spend a ridiculous amount of time (normally when procrastinating, bored, or both)on the website Facebook
2. to look up persons whom you are not related or affiliated with and/or have no intention of being friends with in real life because of some amount of potential weirdness, hotness, lameness or other limiting factor
A Facebook creep knows of all flattering and compromising pictures of a person, as well as where they are, and follows the developments on the person's wall closely, perhaps to spot a lover not mentioned in the relationship status.
Curtis: "Tory! Did you see those new pictures of Chris?"
Tory: "Those were up yesterday. I love the one where he was hammered!"
Person 2- What a facebook creepers!
Person 1- Can you believe Nick goes out with this girl who he met on facebook. That's not wierd or anything
Person 2- Ha,Ha! I'm sure this kid thinks he is the man now cause he has a girlfriend. Too bad the only reason he goes out with her is because of facebook.