Foursquare breaks 3 million users, now tells you when you'll be mayor
Don't discount how much people care about mayorships, either. A recent study found that mayorship battles were one of the major reasons people use Foursquare's "off the grid" check-ins, which give points while concealing your location from your friends.
Foursquare is becoming a bigger deal all the time, and it now has 3 million users worldwide. That's compared to the 105 million that Twitter announced back in April at the Chirp conference.
Yeah, I know that Twitter has grown since then, but it does help put things into perspective, considering that Foursquare is a newer company. And Facebook Places hasn't hurt Foursquare, either. In fact, Places launch day was Foursquare's biggest day of signups yet.