Which social networking has rooted in which country? Just have a look at the world map shown aside to this article. The Graph shows highest ranking social networking by traffic, not by page views, or members. India is flooded with Orkut, Russia by V Kontakate, China by Grono, Australia by Face book.
Africa is rocked by Skyrock, Facebook and HiFi, while Myspace, Facebook, Hifi is revolutioning America, Japan has been mixed with Mixi on the other hand, Bebo and Cyworld are just small lakes in the ocean of social networks.
when distances are going very wide this sites are the way to get the people closer