Abstract: Methods and apparatus for finding detecting unique on-line users for advertisement or content targeting are disclosed. A bid request with initial fingerprint context data for a user and for content that is requested by such user is received at a bid management system, and the bid request is received with or without a user identifier. At the bid management system, an optimum bid for the bid request is determined based on the initial fingerprint context data for the user and the content. The optimum bid with a reference to an advertisement and a script for obtaining additional fingerprint context data from a device of the user is sent from the bid management system. The additional fingerprint context data is received and a unique user identifier is assigned in association with a combination of the initial and additional fingerprint context data.

Abstract: In a processing system for facilitating on-line advertising or marketer engagement on physical user devices, a device graph specifies confidence metrics for pairs of a plurality of related devices. Specific stable user identifiers are propagated from a first set of devices to a second set of devices having unstable user identifiers based on the confidence metrics. Each device in the second set of devices are designated with a single one of the stable user identifiers that have been propagated to such device based on the confidence metric or combination of confidence metrics that are associated with such single stable user identifier as compared to other confidence metrics associated with other ones of any stable user identifiers that have been propagated to such device.

Abstract: Methods and apparatus for finding detecting unique on-line users for advertisement or content targeting are disclosed. A bid request with initial fingerprint context data for a user and for content that is requested by such user is received at a bid management system, and the bid request is received with or without a user identifier. At the bid management system, an optimum bid for the bid request is determined based on the initial fingerprint context data for the user and the content. The optimum bid with a reference to an advertisement and a script for obtaining additional fingerprint context data from a device of the user is sent from the bid management system. The additional fingerprint context data is received and a unique user identifier is assigned in association with a combination of the initial and additional fingerprint context data.