On September 15th, Mark Zuckerberg announced that Facebook "now serves 300 million people across the world."  It seems the site's growth hadn't exactly come to a stop, either, as about a month and a half later, stats indicate the number of users has risen to at least 325 million.



This isn't a case of comScore versus Hitwise or Compete versus Nielsen discrepancies.  Nick O'Neill reported today, "According to Facebook's own advertising statistics . . . the company is now beyond 325 million users and continuing to grow."  So everyone should be on the same page.



What we appear to have here is a social network simply gaining 25 million users in the space of seven weeks.



That's an impressive fact all by itself.  Another way of looking at it is that, if Facebook users created their own country, the Land of Zuckerberg would have a larger population than the good old U.S. of A. (even if the users somehow didn't leave America at the same time).



What's next, then?   Well, that's hard to say.  Facebook's almost sure to need additional hardware and employees.  Marketers are l