It took mankind 20,000 years to reach 200 million strong. Facebook accomplished this in less than 7 years. The platform surpassed their 200 millionth user sometime yesterday.
Facebook users add up to the 5th most populous country. More than 3.5 billion minutes are spent on Facebook each day. Facebook has the largest number of Photos on the Internet. Check out this cool slide-show for more stats and a cool timeline of how the platform proliferated throughout the world - http://blog.facebook.com/blog.php?post=72353897130