Google, Yahoo gain share in U.S. Web search market

CNET News.com: "Google has increased its share of the U.S. Web search market to 47.4 percent with a gain of 0.4 percent during December, while No. 2 ranked Yahoo also edged higher, a survey said Monday.
Web audience measurement firm comScore Networks said No. 3-ranked Microsoft's share slid 0.5 percent to 10.5 percent of U.S. Web searches while InterActiveCorp's Ask.com's share dipped 0.1 percent to 5.4 percent.

Google has gained share in 16 of the last 17 months in the United States, the world's largest Internet market, according to comScore data. "