Foursquare just released a new version of its mobile application for sharing your location with friends, including a new feature that should make the app a much bigger presence in users’ lives. Taking advantage of new abilities in the iPhone’s operating system, Foursquare 1.3 includes push notification, delivering a message whenever your friends check in at a new location, whether you’re using the app or not.
New York City-based Foursquare is run by the same team that created Dodgeball, a location-based social networking service that was acquired and then neglected by Google. The concept is pretty simple — whenever you arrive at a new location, you “check in,” and your friends get to see where you are. You also win points for things like visiting new places and checking into multiple spots on one trip. Until now, however, you have to turn on the app to see what your friends are doing, so if you’re not checking in yourself, you probably don’t see what your friends are doing. With push notification (which some users have been playing with already, but which just