Abstract: Disclosed are methods and apparatus, including computer program products, implementing and using techniques for methods and apparatus, including computer program products, implementing and using techniques for identifying and classifying a network document as a spam candidate. In one aspect of the present invention, a network document is retrieved. Affiliate identification information is identified in the network document. One or more publications are associated with the identified affiliate identification information. Publication data for the network document is determined according to the identified affiliate identification information and the identified one or more publications. When it is determined that the publication data satisfies a condition indicative of spam, the network document is classified as a spam candidate.