57. Drew Houston and Arash Ferdowsi

CEO and Cofounder; CTO and Cofounder, Dropbox

Drew Houston's online storage company Dropbox is on fire. In November, Dropbox hit 100 million users, which is impressive given that Apple cofounder Steve Jobs previously told Houston Dropbox was a feature, not an actual product.

Some feature. Dropbox is now profitable and as of November, the company hadn't spent any of the $250 million it raised the year before.