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In June 2009, Google Sites had a 65.0 percent share of searches in the U.S. core search market, compared to 28.0 percent for Yahoo Sites (19.6%) and Microsoft Sites (8.4%) combined.

Despite lagging considerably in terms of overall search share, the combined searcher penetration of Yahoo! and Microsoft was 73.3%, not far behind Google at 84.0%. The source of the discrepancy between search share and searcher penetration is that searchers on Google conducted significantly more searches on average in a month (54.5) than did searchers on Yahoo and Microsoft (26.9).

comScore said that it also conducted an analysis of search loyalty among users of the top three engines in order to determine what challenges exist for the Yahoo!-Microsoft partnership. The analysis examined the use of the various alternative search engines by users of the Google, Yahoo! and Microsoft engines, revealing that those who searched on Google had the highest loyalty rate, with 68.9% of all their searches occurring on Google Sites.

Users of the engines at the combined Yahoo! and Microsoft Sites conducted 32.6% of their searches on the combined Yahoo! and Microsoft Sites, but a much higher 60.7% of their searches on Google Sites.

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