If you live here in the U.S., you would not be faulted for thinking the rest of the world also uses nothing but Facebook and Twitter. In fact, you would be mostly right. With over 1 billion users, Facebook is the dominate social network across the globe. However, there are some countries that prefer to use their own home-brewed social networks. Some, like China's Qzone, are big enough to make Zuckerberg sweat, while others, like Germany's StudiVZ, are simply happy to be in the game. Read on to find out what services people across the globe are using to stay connected.