Hitwise runs the numbers and notes that for the first time ever last week Facebook passed Google (NSDQ: GOOG) to become the most visited website in the U.S. It’s not as though Google has stopped growing; it’s just that Facebook is growing at a much faster clip. The caveats: It’s only one research organization, one metric (market share of all visits) and one week. But take a look at the trend.

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