Literally…
What are the most popular social networks around the world? 
Vincos Blogmashes up Alexa and Google Trends data to color code the world according to which social network is most heavily used.
Green is the color of Facebook. Juxtapose this map and Facebook’s recent explosion of traffic and it is easy to see how the service is consolidating the world of the social web with the same kind of impact that Google conslidated the world of search engines almost a decade ago.
