To have your Facebook (or other social networking site) used by someone else when you have accidentally left it logged in.
Tom was using my computer and the bastard Faceraped me because I hadn't logged out of Facebook.
1. When someone molests facebook account because you were too retarded to log out.
2. When facebook changes your setting against your wishes
Tim: I'm glad you came out of the closest yesterday.... I've been meaning to ask you something..
Rob: What? What do you mean?
Tim: You status says "I'm a cock sucking fudge packer"
Rob: shit, I've been faceraped....
Rob: What were you going to ask me?
Tim: uh...umm... You see that Eagles game yesterday?
Facebook: Enjoy your new facebook profile
Steve: Fuck I've been faceraped! WHAT WAS WRONG WITH THE OLD ONE!?