1. A method comprising: accessing a message with a computing device of a monitoring entity, the message sent from a requesting device in response to accessing media that includes a tag causing the requesting device accessing the media to send the message to the monitoring entity with an identification of a geographic location of the requesting device and media identifying information; determining, with the computing device of the monitoring entity, locations of a plurality of panelist homes; comparing, with the computing device of the monitoring entity, the geographic location of the requesting device with the locations of the plurality of panelist homes; and when the geographic location of the requesting device is within a threshold distance of a first location of a first one of the plurality of panelist homes: identifying, with the computing device of the monitoring entity, a user of the requesting device as a panelist residing at the first one of the panelist homes; and associating, with the computing device of the monitoring entity, the media identifying information with panelist data associated with the first one of the panelist homes.