Systems, methods and computer-readable media for obtaining and enhancing metadata for content items are provided. In an aspect, a system can include an identification component configured to identify a resource, accessible to the system via a network, that includes a reference to a content item, and an extraction component configured to extract metadata associated with the resource and the reference to the content item. The system can further include an index component configured to associate at least a portion of the metadata with the content item in a data store, and a matching component configured to identify one or more reference content items based on correspondence between the metadata and reference metadata respectively associated with the one or more reference content items.