5. Facebook is a country. With over 500 million users as of July 2010, Facebook, were it a country, would be the 4th largest in the world. If you are an English-speaking American who has lived most of your life in one small town, how would you like to be dropped off on a street corner in China to find your way? You might want to learn the language and know a few of the local customs before you set out to do much of anything.