Google Sites led the U.S. explicit core search market in November with 66.2 percent market share, followed by Yahoo! Sites with 16.4 percent and Microsoft sites with 11.8 percent (up 0.3 percentage points), according to comScore's November 2010 U.S. Search Engine Rankings. Ask Network accounted for 3.6 percent of explicit core searches, followed by AOL LLC Network with 2.0 percent, comScore said.

More than 16.0 billion explicit core searches were conducted in November. Google Sites ranked first with 10.6 billion searches, followed by Yahoo! Sites in second with 2.6 billion and Microsoft Sites in third with 1.9 billion. Ask Network accounted for 580 million explicit core searches, followed by AOL LLC Network with 327 million.

Google Sites accounted for 64.3 percent of total core search queries conducted, followed by Yahoo! Sites with 19.3 percent (up 0.8 percentage points) and Microsoft Sites with 11.3 percent. Ask Network comprised 3.3 percent of total search queries (up 0.1 percentage points), followed by AOL LLC Network with 1.8 percent.

In order to accurately represent the continued evolution of the search landscape, comScore is providing insight into the share of algorithmic Explicit searches that are powered by Google and Bing, and branded as such to the consumer. Google's "powered by" share is composed of searches conducted at Google entities, as well as branded searches at AOL and Ask. Bing's "powered by" share is composed of searches conducted at Microsoft entities as well as branded Yahoo! entities.

In November, 69.2 percent of searches carried organic search results from Google, while 24.0 percent of searches were powered by Bing organic results, according to comScore's data.