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.

According to a recent study by ComScore, Google's U.S. search share hit 65.6% in October, making it slightly higher than its September share of 65.3% . Google's popularity had been declining in recent months, with its share dipping to 64.8% in August, which was its lowest since September 2009.