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Google’s reign as the most-visited site in the U.S. has come to an end. The social-networking site Facebook has ousted the search engine as 2010’s most-visited site in U.S., accounting for 8.9 percent of all browsing. Google, which had been the top-ranked site in 2008 and 2009, came in second, accounting for 7.2 percent of all visits. But when all of Google’s properties are included—including YouTube.com and email—Google accounted for 9.2 percent of all visits, topping Facebook. Yahoo and all its properties ranked third, at 8.1 percent.