Location-Based Social Software for Mobile Devices

A method for communicating location information to a device includes receiving, at a computer system that implements a social networking service, location information that represents a geographic location of a device associated with a first user; associating, by the computer system, the received location information with a profile associated with the first user; and sending, from the computer system to a device associated with a second user, a message that is generated based at least in part on the location information.