To understand overall Web traffic, the BBC, using Nielsen data, tracked the Top 100 sites by unique visitors in January from Australia, France, Germany, Great Britain, Italy, Spain, Switzerland, Brazil, and America.
The visual shows traffic by country for the Top 10 global social networks, as visited by 830 million people in October, 2009. Thanks to Mark Blevis, who sourced this from National Geographic and posted it to his blog.