Nielsen has released its December 2009 search engine rankings. They reflect gains by Google and a minor gain by AOL compared with November 2009. The data show declines by Yahoo and Bing. Here is the chart:

Compare data from November:

And finally, compare comScore’s November search rankings:

I think there can be no argument now that Yahoo has lost ground over the past several months.

Related Topics: Google: Web Search | Microsoft: Bing | Stats: comScore | Stats: General | Stats: NetRatings | Stats: Popularity

About The Author: Greg Sterling is a Contributing Editor at Search Engine Land. He writes a personal blog Screenwerk, about SoLoMo issues and connecting the dots between online and offline. He also posts at Internet2Go, which is focused on the mobile Internet. Follow him @gsterling. See more articles by Greg Sterling