Better yet, what mathematics did he specifically use when developing Facebook? It's my understanding that most of the "innovation" that went on involved stealing someone's code and marketing the end result to a niche community (Ivy Leaguers), and using the reputation gained from that to appeal to the masses. It took people out of the ghetto of MySpace and put them into a pristine, controlled environment.
Tortured genius, or lucky asshole with a lot of money? You decide.