US Patent 8156005 Systems and methods of contextual advertising

A system of contextual advertising is disclosed. The system includes a message receiving module to receive a message from a sender and determine a recipient of the message. The system further includes an advertisement selection module to select an advertisement. The advertisement is selected based on at least one of a characteristic of the recipient, a characteristic of the sender, and a characteristic of the message. The system further includes a message delivery module to send the message to the recipient and an advertisement delivery module to send the advertisement to the sender.