Loopt, one of the earliest location-based social networking, is back now with Loopt 4.0, which offers a complete redesign, integration with Facebook Places, and a real-time location tracker reminiscent of Google Latitude.
Loopt's FB itegration now lets you sync your own checkins between Loopt and FB and see your friends' FB checkins on Loopt.
Loopt 4 also has auto-location sharing toggle. You'll find a switch on the homepage to turn automatic sharing on or off. When it's on, it functions much like Google Latitude, updating your location via GPS, without the need to check in. Because that's an awful lot to share publicly, auto-sharing has its own set of privacy settings, so you can limit it to your close friends.
Loopt has also added a "pong" feature to its existing "ping." Now you can attach a message to ping, and your friend can respond with a "pong" tagged with their location. Basically, it's text-messaging plus location.
Download From: iTunes App Store