Give a look to how the popularity & total traffic has changed in these last 3 years – here the 2007 map:
and here the more updated 2010 version:
Of course we all see the incredible ascent of Facebook, and Twitter, Skype… none of which was almost present few years before. The only geo-specific property worth noting is QQ in China.
PS the source is xccd, and it is not a perfect research, yup; but visuals give the idea!