facebook

mark elliot zuckerberg
has a fetish for asian women
was put on probation for 'improper social behaviour'

started a Harvard University 'hot or not' website by stealing photos of students from yearbooks and getting other students to rate them, but it was shut down

called all facebook users 'dumb fucks' when he was 19 when other students started sending him photos and personal information to put onto facebook

stole the idea of 'liking' things/statuses and phototagging from friendster (but paid for it later)
stole the idea of instant updates from twitter

ConnectU
zuckerberg was hired by colleagues at Harvard to work on a social networking website ConnectU, but then quit and stole their ideas and source code
the founders of ConnectU sued him and they reached a settlement agreement, but sued again when they claimed facebook overstated the value of their stock

houseSYSTEM
zuckerberg became friendly with the founder of the houseSYSTEM website and discussed technical aspects of the website with him, then started facebook and stole many of his ideas

paul ceglia
this dude claims he signed a contract with zuckerberg in 2003 to design and develop facebook in return for a 50% share of all revenue earned, but zuckerberg stooged him out of the contract