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For over a year, the all-powerful Facebook has been the top social media site driving Web traffic in the U.S. But this past month, Facebook fell to second place, GigaOM reports.
According to global Web analytics service StatCounter, Web discovery engine StumbleUpon is now the biggest traffic driver among social media websites in the U.S. Data shows that StumbleUpon dethroned Facebook in mid-June, with StumbleUpon now driving around 49 percent of traffic and Facebook falling to 37 percent.