If social media were a game of Risk, Facebook would be set up for the win, writes Erick Schonfeld. The social network is sweeping the globe, according to this world map showing the dominant social networks in each country. Facebook reigns in much of the world, but "pockets of resistance" remain, Schonfeld writes, in Russia, China, Brazil, India and Thailand. Global rivals include Orkut, hi5 and Friendster.

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