Source: StatCounter Global Stats – Social Media Market Share

According to StatCounter Global Stats, the real-time web analytics site by StatCounter, StumbleUpon surpassed Facebook for driving web traffic among all social networks in the US. StumbleUpon now drives 49% of traffic while Facebook dropped to 37% despite all the media stir around Facebook’s new features.

Since the original co-founders bought back the company from eBay in April 2009, StumbleUpon has been quietly reinventing itself as the social search engine where users discover sites they would not otherwise find through traditional channels. Given that Twitter continues to slides in retention (it only drives 3.8% of traffic), focusing on infrastructure changes that serve advertisers more than the community, it is time to give StumbleUpon a second look.