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Quora

Quora

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Quora

Entrepreneurs: Adam D'Angelo, 26, and Charlie Cheever, 29, co-founders

Funding: Benchmark Capital, amount not disclosed

The founders worked together at social networking service Facebook, with Adam D'Angelo as chief technology officer and Charlie Cheever leading Facebook Connect. Quora, founded in 2009, is a question-and-answer site that focuses on providing new information on such heady subjects as astrophysics and private-equity investing, along with more common topics such as the difference between butterscotch and caramel. The Palo Alto (Calif.), company has attracted fans that include Larry Summers, former director of the National Economic Council, and investor Marc Andreessen.

Wisest funding decision: "We've only raised one round of funding from Benchmark Capital. We've been very happy with them."