1. A computer-implemented method for classifying content resources, comprising: for each of a plurality of content resources, identifying one or more corresponding queries which resulted in selection of the content resource from among search results corresponding to the one or more queries; identifying itemsets associated with each of the queries, at least some of the itemsets representing patterns in the associated queries; generating representations of each of the content resources with reference to the itemsets associated with the corresponding queries; and classifying each of the content resources using the representations.