Methods, systems, and apparatus, including computer programs encoded on a computer-readable storage medium, and including a method for providing content based on social influence scores of publishers. The method comprises identifying a social influence score for each of a plurality of users associated with a social network where one or more of the users is also a publisher of content. The method further comprises receiving a request for content, the content to be delivered along with content provided by a content publisher. The method further comprises determining a social influence score for the particular content publisher and identifying one or more offers associated with content, where each offer is based at least in part on a specification by a content sponsor of at least a minimum social influence score for a given impression. The method further comprises providing a content item based on the one or more identified offers.