Abstract: A computer-implemented system and method of presenting advertisements to a commuter traveling on a transit line of a mass transit system are provided. Advertisements are automatically associated with transit stops of the transit line. The current geographic location of the commuter is monitored while the commuter is traveling. The commuter is automatically associated with a current transit stop based on the current geographical location of the commuter. Whether the current transit stop is associated with one or more of the advertisements is determined. In response to a determination that the current transit stop is associated with an advertisement, one of the advertisements is automatically selected for presentation at a mobile device operated by the commuter. At least a portion of the selected advertisement is presented to the commuter at the mobile device.