Snaptivity - Real-time photo sharing with the world nearby
Foursquare - Foursquare is all about helping you find new ways to explore your city.
Flashgap - Time-delayed photo-sharing app of last night's embarrassment
Tripadvisor - The Tripadvisor mobile app is available for the Android and iOS platforms. It can be used to create reviews of hotels, restaurants, and to chat with other travelers on Tripadvisor forums.
Poparazzi - Take photos of your friends
Yellow Pages - YP.com local search connects you with over 19 million local businesses.