• Business Insider, Friday, September 10, 2010 12:14 PM

Business Insider has a Q+A with Adam D'Angelo the former Facebook CTO who left the social network -- for the second time mind you -- to start the knowledge Quora. Quora is a question-and-answer engine not unike Yahoo Answers, but unlike Yahoo Answers it counts among its power users the likes of Mark Zuckerberh (who D'Angelo went to high school with), Marc Andreessen, and Fred Wilson.

When asked why on earth he would leave Facebook -- twice -- D'Angleo responds, "I felt I could make a bigger impact on the world by starting something new rather than just continuing to optimize Facebook."

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