Digital world measurer comScore released its monthly analysis of United States-based web activity for March 2012 today, and Google debuted at No. 1 in two of the survey’s categories.

Google websites came out on top in the Top 50 Properties category with 189.7 million visitors in March. Meanwhile, Microsoft sites landed the No. 2 spot with 178.9 million visitors, followed by Yahoo! sites at 175.4 million visitors. The Mountain View, Calif.-based Company’s Ad Network also grabbed the crown in the Top 50 Ad Focus Ranking category last month with a reach of 91.7 percent of Americans online. AOL Advertising netted 83.1 percent, and Google itself closed out the top three at 81.7 percent.

Check out the full report for more information (PDF), including details on comScore’s measuring metrix.

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