Facebook founder Mark Zuckerberg announced on Wednesday that the social network has welcomed its 200 millionth user. That means that Facebook Nation now has a larger population than Brazil, and trails only China, India, The United States and Indonesia. So far in 2009, the population of Facebook has grown at a rate of 500,000 a day, whereas the U.S. adds about 7,325 people a day. If Facebook continues to grow at its current rate, it will pass the United States in November and move into third place.