13. A non-transitory computer-readable storage device having computer-executable instructions, the computer-executable instructions when installed onto a computing device enable the computing device to perform actions, comprising: performing a plurality of class-dependent search queries for multimedia content; receiving multimedia content results for each of the plurality of queries including content information about each of multimedia content results; employing the content information to identify a source for each of the multimedia content result; employing a weighted citation network of relationships based on the identified source for each multimedia content to identify authority scores for each source within the weighted citation network, 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 multimedia content; and employing the identified authority scores to rank order a display of a search-query result.
13. A non-transitory computer-readable storage device having computer-executable instructions, the computer-executable instructions when installed onto a computing device enable the computing device to perform actions, comprising: performing a plurality of class-dependent search queries for multimedia content; receiving multimedia content results for each of the plurality of queries including content information about each of multimedia content results; employing the content information to identify a source for each of the multimedia content result; employing a weighted citation network of relationships based on the identified source for each multimedia content to identify authority scores for each source within the weighted citation network, 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 multimedia content; and employing the identified authority scores to rank order a display of a search-query result. 15. The non-transitory computer-readable storage device of claim 13 , wherein the multimedia content comprises images and near-duplicate detection is employed to identify related multimedia content that is used to generate the citation network of relationships.