1. A method for online re-targeted advertisement selection, comprising: receiving a description of online activities for a collection of online identities for users accessing one or more affiliate web sites; identifying a desired behavior, the desired behavior describing a user interaction that indicates that an online identity demonstrating the desired behavior is more likely to be responsive to a re-targeted advertisement; analyzing the description of online activities to determine whether a particular online identity appearing in the description of the online activities demonstrates the desired behavior; generating a watch list of users to receive re-targeted advertisements based on analyzing the description of online activities; monitoring, in real-time and from the one or more affiliate web sites, information related to user interaction with the one or more affiliate web sites; receiving, from within the monitored information, a request to display advertising content to a user; determining that the user appears in the watch list of users to receive re-targeted advertisements; and selecting, in response to the request, advertising content for display based upon determining that the user appears in the watch list of users to receive re-targeted advertisements.
1. A method for online re-targeted advertisement selection, comprising: receiving a description of online activities for a collection of online identities for users accessing one or more affiliate web sites; identifying a desired behavior, the desired behavior describing a user interaction that indicates that an online identity demonstrating the desired behavior is more likely to be responsive to a re-targeted advertisement; analyzing the description of online activities to determine whether a particular online identity appearing in the description of the online activities demonstrates the desired behavior; generating a watch list of users to receive re-targeted advertisements based on analyzing the description of online activities; monitoring, in real-time and from the one or more affiliate web sites, information related to user interaction with the one or more affiliate web sites; receiving, from within the monitored information, a request to display advertising content to a user; determining that the user appears in the watch list of users to receive re-targeted advertisements; and selecting, in response to the request, advertising content for display based upon determining that the user appears in the watch list of users to receive re-targeted advertisements. 3. The method according to claim 1 , wherein the description of online activities is an email message received from the Web site, the email message providing a list of prior activities of the user at the Web site.