Someone who goes to your facebook profile to add all your friends as his own. Usually done because they are in a mental contest with that person. Gotten from wordplay between Facebook and Crook
When someone using the online social utility, goes on you profile and copy/paste all of your info. The info includes music, movies, books, tv shows, and interests. The person steals the information on you profile making them a crook, or in this case a facecrook.
person 1:"yo some facecrook just took all the same shit of my info on facebook"
person 2;"so fucking what its facebook"