StumbleUpon accounts for half of all U.S. social media traffic on the Web

According to StatCounter, StumbleUpon has overtaken Facebook over the last two months and makes up over 50 percent of all social traffic in the United States as of August 2011. Two years ago, StumbleUpon was the main driver for social media traffic, but lost market share to Facebook over the last 18 months.

As of August 2011, Facebook has fallen to about 38 percent of all U.S. traffic while sites like Twitter, Myspace, Digg, Reddit, YouTube and others are in a distant third. StumbleUpon has a relatively small user base (12 million) compared to Facebook (750 million), but the service is specifically designed to “stumble” between websites and continuing to check out new links.

StumbleUpon accounts for half of all U.S. social media traffic on the Web