Sean Parker, Facebook's founding president and a co-founder of Napster, has given $100,000 to the ballot initiative that would legalize marijuana in California.

Parker is portrayed by Justin Timberlake in "The Social Network," forcefully shaping his public image as the bad boy of Silicon Valley. He's been playing out that image at trendy nightclubs in New York City.

He's also a preternaturally gifted programmer and press-shy suddenly famous billionaire with some extra cash to shower on causes he supports. Parker, who's a venture capitalist with Founders Fund and one of the founders of Causes, the Facebook application that helps you rally support and donations for nonprofits and charities, can be counted on by friends to contribute to their causes. Among the major supporters of legalizing marijuana in California is Facebook co-founder Dustin Moskovitz, who has given $70,000.

Parker could not immediately be reached for comment.

-- Jessica Guynn