Someone who goes on Facebook and plays practical jokes by tagging you in strange pictures that you don't belong to, posting awkward pictures of you as their main picture, creating fake facebook accounts in your name, constantly harassing your wall and/or other acts of Facebook terrorism.
Dude 1: "What the hell? Someone tagged me in this picture but that's not even me! This guy looks like a jackass!"
Dude 2: "Yeah, must have been Abe, the other day he made a fake fan profile of you being a rapper, you have 11 fans already dude!"
Dude 1: "Goddamn facebook terrorist!"