2. The system of claim 1 , wherein each of the plurality of user identification modules is configured such that a first user identifier assigned to a first user by a first one of the plurality of user identification modules may be correlated to a second user identifier assigned to the first user by a second one of the plurality of user identification modules.
1. A system for aggregating user profile information, comprising: a profile aggregation module; and a network of affiliated websites comprising a plurality of websites, wherein each of the plurality of websites in the network of affiliated websites is resident on a respective non-transitory computer-readable storage media and comprises; a user identification module to identify users accessing the respective website, a user interaction monitor to monitor and to record user interactions on the respective website into one or more user interaction records, wherein each of the user interaction records includes one or more user interactions and a user identifier of a user associated with the one or more user interactions, and a communication module to transmit the user interaction records to the profile aggregation module; wherein the profile aggregation module is configured to receive a plurality of user interaction records from the plurality of websites in the network of affiliated websites and to generate a user profile of a particular user of the plurality of websites using the plurality of user interactions.