Question-and-answer sites like Yahoo Answers may offer a quick way to ask questions and get answers, but they tend to be plagued by wisecracks, poor spelling, and generally low quality. On the other hand, a new site targeting this niche, Quora, is going to great lengths to keep quality high.
To sign up with Quora, users log in via their Facebook or Twitter ID, making anonymity--and the bad behavior it can engender--more or less impossible. And much like on Twitter, users can follow each others' participation, as well as particular questions or topics.

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