Over the weekend, Foursquare hit a registered user milestone. Although many of you aren't super familiar with it, for those of you who are using location-based services, Foursquare is tops. And now that Facebook Places joined the game, it's safe to say that location-based features like Foursquare are only going to keep growing.
It's grown quickly in its less-than-two-year existence; can you guess how many registered users are on Foursquare?
How Many Registered Users Does Foursquare Have?
How many registered users does Foursquare have?