Dynamic geographic beacons for geographic-positioning-capable devices

A method comprising:

• receiving, at a mobile device, information on one or more entities socially connected to a user associated with the mobile device, the information comprising a location for each of the entities and an affinity score with respect to the user for each of the entities, the user being socially associated with the entities through an on-line social network;
• determining on a periodic basis, by one or more processors of a geographic-positioning component of the mobile device, a current location of the mobile device;
• determining, for each of one or more of the entities, a radius from the location of the entity based at least in part on the affinity score for the entity;
• determining, by the processors of the geographic-positioning component, whether the current location is within an area defined by one of the radii;
• and
• if the current location is within the one of the radii, then transmitting by the processors of the geographic-positioning component a message to one or more other processors of the mobile device, the message causing one or more of the other processors to transition from a sleep state to an active state.