1. A computer-implemented method of identifying spam in a collection of multimedia items, comprising: storing the collection of multimedia items; establishing a set of top queries for the multimedia items in the collection, wherein the set of top queries comprises a plurality of frequently made queries for the multimedia items in the collection; identifying results of each query in the set of top queries, wherein the results comprise one or more of the multimedia items from the collection; for a multimedia item in the collection, counting a number of times that the item appears in the results of the set of top queries; and responsive to the number of times that the multimedia item appears in the results of the set of top queries exceeding a predetermined threshold, marking the multimedia item as spam.