Social media marketing and sharing is dominated by the big three: Facebook, Twitter and YouTube

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However, as you can see by these real-time stats, StumbleUpon drives more referral traffic than YouTube, Twitter, Reddit, LinkedIn and Digg combined.

Source: StatCounter Global Stats – Social Media Market Share

Stats are based on aggregate social media and other data collected by StatCounter on a sample exceeding 15 billion pageviews per month.

Social media infographic from StumbleUpon …

And here’s another infographic with the results of an extensive survey profiling media use in 2011, including social media giant, Facebook.