An act in which one looks at a friend's and/or stranger's facebook profile, pictures, and recent activity usually of the opposite sex. Also the act of getting random information from a person's Facebook profile by snoping around. Everyone denies their involvement in this act (when in reality most people do it when bored), then in turn accuse someone else of doing it later.
Farva: "Hey, did you hear John broke up with Rachel?
Josh: "Uh, how'd you know that? Were you facebook creeping AGAIN Farva?"
Farva: "No, of course I wasn't! You do that, not me!"