10. A system comprising: a machine having a memory and at least one processor; and a metadata refinement module, executable by the at least one processor, configured to: receive user behavioral data for search results of a search query, the user behavioral data comprising clickstream data indicating that a user selected the search results including an untagged item and a plurality of tagged items during a single search event; determine that the selected plurality of tagged items corresponds to a first type of metadata and the untagged items are selected during the single search event that includes the plurality of tagged items, the selected plurality of tagged items transgressing a threshold number of selected tagged items that corresponds to the first type of metadata; identify the untagged item as a candidate to be tagged with the first type of metadata corresponding to the tagged items based on the determined plurality of tagged items corresponding to the first type of metadata and transgressing the threshold number of selected tagged items; and assign data corresponding to the first type of metadata for the tagged items to the untagged item in response to identification of the untagged item as the candidate to be tagged with the first type of metadata.
10. A system comprising: a machine having a memory and at least one processor; and a metadata refinement module, executable by the at least one processor, configured to: receive user behavioral data for search results of a search query, the user behavioral data comprising clickstream data indicating that a user selected the search results including an untagged item and a plurality of tagged items during a single search event; determine that the selected plurality of tagged items corresponds to a first type of metadata and the untagged items are selected during the single search event that includes the plurality of tagged items, the selected plurality of tagged items transgressing a threshold number of selected tagged items that corresponds to the first type of metadata; identify the untagged item as a candidate to be tagged with the first type of metadata corresponding to the tagged items based on the determined plurality of tagged items corresponding to the first type of metadata and transgressing the threshold number of selected tagged items; and assign data corresponding to the first type of metadata for the tagged items to the untagged item in response to identification of the untagged item as the candidate to be tagged with the first type of metadata. 11. The system of claim 10 , further comprising: determining whether all of the tagged items selected during the single search event have identical metadata for the first type of metadata; determining a majority metadata in response to a determination that all of the tagged items selected during the single search event do not have identical metadata, the majority metadata being metadata that is commonly assigned to a majority of the tagged items selected during the single search event; and identifying the majority metadata as data with which to tag the untagged item.