Think 50% friend-finder, 30% social cityguide, 20% nightlife game. Wanted to build something that not only helps you keep up with your friends, but exposes you to new things in and challenges you to explore cities in different ways.
Foursquare is essentially a re-envisioning of Dodgeball, Twitter’s precursor and a cult phenomenon until GoogleGoogle reviews left it for dead, and actually hails from one of the guys that worked to build that app. Foursquare, which offers an iPhone app or mobile browser experience, works by letting you tell the app where you are and then lets your friends know where to find you. All you need to do is check-in via SMS (text to 50500) or mobile app.