Appletell reviews FourSquare for iPhone, iPod touch

FourSquare is a social media application designed to bring people together in the real world, using geolocation and other social media apps. After you register (for free), you can “sign in” to locations around town and it’ll notify your friends (and other FourSquare users) where you are. If you register your Twitter or Facebook account, you can broadcast your location using those as well (it will also scan your list of friends to find out if any of them are on FourSquare).