After reading comments and looking at the overall architecture view of the framework, I decided to investigate the android.location API a little more closely. The first item is interesting because it would allow you to conserve battery life and, I assume, toggle between (free) GPS positionning and perhaps (not so free) cell-tower triangulation. The second item is where the interesting stuff can happen. Imagine an application that knows the location of all your friends and the location of their favorite spots along with the permission associated to all those locations. When you are moving around the mobile application on the device could register some intents (by obtaining specific lat/long information from a dedicated server) to alert you of interesting places but also of nearby friends.

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