Q&A sites are grabbing the spotlight thanks in part to the emergence of Silicon Valley darling Quora, which has become a destination for many tech luminaries and could be worth $300 million. But the genre is still hampered by a lot of bad answers and unanswered questions. Taking a somewhat different tack from Quora is New York start-up Stack Overflow, which has been growing rapidly by focusing on specific content niches. Gigaom
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