By skyforbes Rewatching the movie I realized that right from the start Mark was taking other people's ideas and twisting them just enough to call them his own.
When he came up with facemash it was after his roommate suggested comparing girls to farm animals. He then took that idea and switched it to comparing classmates against each other.
He did the same thing with Facebook. Took the Harvard Connection idea and twisted it just enough to call it his.