40. The method of claim 22 , wherein the user identifier comprises a browser cookie.
22. A method for aggregating user interactions into a user profile, comprising: logging a plurality of user interactions at a plurality of websites in a network of affiliated websites; associating each of the plurality of user interactions logged at each of the plurality of websites with a respective user identifier; combining the plurality of logged user interactions from the plurality of websites in the network of affiliated websites; correlating the combined user interactions logged by the plurality of websites in the network of affiliated websites with respective users using the user identifiers associated with each of the logged user interactions; and generating a plurality of user profiles using the plurality of correlated user interactions.