Seattle - Online retailer Amazon.com (NASD: AMZN) on Thursday formally introduced its Askville.com site, where users ask and answer each other's questions on various topics. The site rewards users who share their knowledge by answering questions posed with "Quest Gold," which can be redeemed for Amazon gift cards and other rewards. The site has been in beta testing mode since December 2006.

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http://www.askville.com