Striking it rich in tech – In perhaps the most famous entrepreneur story of the 21st century, Mark Zuckerberg and several classmates founded Facebook from a Harvard dorm room in 2004. Facebook now has more than 1 billion users worldwide, and Zuckerberg himself is worth about $30 billion, making him one of the world's richest men.
Striking it rich in tech – A number of entrepreneurs have parlayed tiny tech startups into millions, or even billions. The latest to hit the jackpot: WhatsApp founders Brian Acton, left, and Jan Koum, who sold their mobile messaging service to Facebook for $19 billion in cash and stock.
Striking it rich in tech – Jack Dorsey, Evan Williams and Biz Stone, left to right, started Twitter in 2006. The fast-growing company went public last year and is now worth more than $30 billion, making them all very wealthy.
Striking it rich in tech – David Karp founded Tumblr, the blogging platform, in 2007 when he was 20 years old. Last year it was bought by Yahoo for $1.1 billion.