Microsoft's Bing search engine now ranks second behind Google. According to statistics released on Wednesday by comScore Inc., Bing and Microsoft's other websites fielded 2.75 billion search requests in the U.S. during December, beating Yahoo for the first time. Bing's December search volume translated into a 15.1% share of U.S. search traffic, while Yahoo had 2.65 billion search requests, which amounted to a 14.5% share.

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