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Comparing December's data with some of the measurements from past months seems to indicate that Bing's marketshare surge was just temporary.
Below we've included Nielsen's data from December 2009 and November 2009. As you can see, Google held a 67.3 percent share in U.S. searches for December 2009. That's up nearly two full percentage points when compared with the November statistics.
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Looking at the charts, it's clear that this growth came directly at the expense of Yahoo and Bing. Both search engines fell nearly a full point from November to December. Google's high-profile rollout of real-time search results the first week of December might have had an impact.