Entrepreneurs: Jake Mintz, 28; David Lieb, 30

Funding: $20 million from Andreessen Horowitz, Sequoia Capital, Y Combinator, and angels that include Ron Conway, Aydin Senkut, and Ram Shriram

David Lieb came up with the idea for Bump while he and Jake Mintz were attending business school at the University of Chicago. Lieb wanted to make exchanging contact information as easy as bumping two phones together. The Bump app has been downloaded 32 million times, letting users of Apple (AAPL)- and Google (GOOG)-powered devices share photos, messages, applications, money, and more.

Wisest funding decision: Participating in Y Combinator in summer 2009 for the network, advice, and mentorship the program provided, they say.
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