We now have over 25MM users worldwide! While we can't share specific demographic or geographic information at this time, we can tell you the following stats:
+ Over 3 billion check-ins + Over 25 million people around the world + Over 5 million check-ins per day + Over 1 million visits to our website every day + About 50% male, 50% female, approaching parity + About 50% usage in U.S., 50% international + Largest age demographic is 18-34 years-old + Over 1,000,000 businesses using the merchant platform + Over 25,000 developers/brands building off the foursquare API + Tens of millions of Tips and To-Do's + Over half a million Lists + Over 40 million venues + Over 100 employees between our headquarters in NYC and satellite office in SF + foursquare is on every major mobile platform, including: iPhone, BlackBerry, Android, Nokia S40, Symbian, Windows Phone 7, and many more. + foursquare is available in 11 languages; English, French, Italian, German, Spanish, Japanese, Portuguese, Russian, Thai, Bahasa, Korean, and Turkish.
You can see more about our service at foursquare.com at foursquare.com/explore