Client-side multimedia content targeting system

One or more non-transitory computer-readable media storing instructions that, when executed by one or more computing devices, cause:

• at a first device, generating first tracking data identifying a first set of programs that have been viewed at the first device;
• at the first device, receiving tracking data for other devices, the tracking data for the other devices describing sets of programs viewed at the other devices
• determining, by the first device, whether the tracking data for other devices identifies an advertisement in the first set;
• responsive to determining, based on the tracking data, that the first set includes a particular advertisement that is also in a second set of programs that have been viewed at a second device, of the other devices, the first device selecting a recommended advertisement, the recommended advertisement being selected from the second set;
• displaying, by the first device, the recommended advertisement.

An apparatus comprising:

• one or more processors;
• a logic configured to generate first tracking data identifying a first set of programs that have been viewed at the apparatus;
• a logic configured to receive tracking data for other devices, the tracking data for the other devices describing sets of programs viewed at the other devices;
• a logic configured to determine whether the tracking data for other devices identifies an advertisement in the first set;
• a logic configured to, responsive to determining, based on the tracking data, that the first set includes a particular advertisement that is also in a second set of programs that have been viewed at a second device, of the other devices, select a recommended advertisement, the recommended advertisement being selected from the second set;
• a logic configured to display the recommended advertisement.