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Google's search lead grows

The company now has 56 percent search market share in the U.S., according to Nielsen/NetRatings.

Google now has 56.3 percent of the share of Web searches in the United States, according to Nielsen/NetRatings. Yahoo's share is 21.5 percent, followed by Microsoft at 8.4 percent, AOL at 5.3 percent and Ask.com at 2 percent. Google had nearly 45 percent growth year over year in the number of searches conducted on its site.

Hitwise's latest figures give Google even greater U.S. market share--more than 65 percent, with Yahoo at 20.9 percent and Microsoft at 8.4 percent.