Remarketing content to a user associated with multiple devices

摘要

Methods, systems, and apparatus, including computer programs encoded on a computer-readable storage medium, and including a method for selecting content. The method comprises anonymously linking plural identifiers, each associated with a user and specific requesting source. Anonymously linking includes linking at least two different identifiers associated with two different requesting sources used to access content, and linking the two different identifiers using an identifier not including any personally identifiable information. The method further comprises identifying a user list associated with a topic and including plurality of entries, each entry satisfying the topic and having an identifier associated with a requesting source and further including information about a type of requesting source. The method further comprises linking an entry in the user list to other identifiers using the anonymous linking, and selecting content for delivery to a user device associated with an entry in the user list based on the linking.