People became the fastest billionaires in the shortest amount of time
Sean Parker – 1.5 years
Computer whiz Sean Parker co-founded music file-sharing site Napster in 1999, but really struck gold when he joined fledgling social media network Facebook in 2004, helping to bankroll the firm and serving as its founding president. A shrewd move as Parker's 4% stake in the company had netted him $1 billion (£777m) by 2011.
