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Google added 0.4% to its share of the U.S. Web search market to reach 47.4% in December while No. 2 Yahoo also inched up 0.3% to 28.5%. comScore Networks, a Web audience measurement firm, also indicated that third-ranked Microsoft lost 0.5% to 10.5% while IAC/InterActiveCorp's Ask.com lost 0.1% to 5.4%. Google has gained share in 16 of the past 17 months. Approximately 6.7 billion searches were conducted by U.S. Web users in December, 30% more than in December 2005. On Google sites, 3.2 billion searches were conducted, and 1.9 billion on Yahoo.

• Sources: Reuters, News.com, ZDNet, ComScore Press Release
• Related commentary: The Online Search Industry: Predictions for 2007, Goldman Raises Google Forecast, Google's Dominance Is More Than Half Over, Jack Biddle on Google's Impending Collapse, Google To Hit $630, Fueled By Non-Search Assets - Jaffray, Don't Like Google's Capitalist Pursuits? Try 'Yahooing' Instead, Google's 70% Market Share: The Bad News, Ask.com: The Little Search Engine That Could (Topple Google?), Yahoo! Aims for Lead in Mobile Search Space, Is Yahoo Go a No Go?. Conference call transcripts: Yahoo: Q3 2006 (Oct 17th, 2006), Google: Q3 2006 (Oct 19th, 2006)
• Potentially impacted stocks and ETFs: Google, Inc. (GOOG), Yahoo! Inc. (YHOO). Competitors: IAC/InterActiveCorp. (IACI), Microsoft Inc. (MSFT). ETFs: Internet HOLDRs (HHH), First Trust Dow Jones Internet Index (FDN), First Trust IPOX-100 Index (FPX), iShares S&P Global Technology (IXN)

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Source: Google, Yahoo Up U.S. Web Search Market Share