1. A network device, comprising: a transceiver to send and receive data over a network; and a processor that operates on the received data to perform actions, including: receiving a plurality of multimedia content including information about the content for each of the plurality of multimedia content; employing the information about the content to identify a source for each of the multimedia content; employing a weighted citation network of relationships based on the identified source for each multimedia content to identify authority scores for each source of the multimedia contents, the citation of network of relationships identifies a citation of multimedia content by network locations, and where the citation of the multimedia content is determined based on detecting that the multimedia content is copied instead of linked from one network location to an other network location; receiving a class-dependent search-query for other multimedia content; and employing the identified authority scores to rank order a display of a search-query result to the class-dependent search-query.