A Map Of Social (Network) Dominance
http://www.techcrunch.com/2009/06/07/a-map-of-social-network-dominance/

Schonfeld, Erick
TechCrunch
2009

Abstract:

Even on the Web, world dominance must be achieved one country at a time. While Facebook has long been the largest social network in the world, and should soon pass MySpace in the U.S., it is not the largest social network in every country.