Gowalla

Keep up with friends on your phone. Connect with friends from Facebook and Twitter to share where you're going. Discover new places and hotspots when you go out, then share your photos, recommendations and trips with friends! Find inspiration to explore the world around you while picking up rewards from local eateries, venues and retail stores.

See the reference side-by-side comparison Foursquare vs Facebook Places, Google Latitude, Gowalla, Loopt