12. The system of claim 9 , wherein the one or more search entities in by the plurality of sessions comprise one or more documents that were returned in response to other queries submitted with the first query in the plurality of query sessions.
12. The system of claim 9 , wherein the one or more search entities in by the plurality of sessions comprise one or more documents that were returned in response to other queries submitted with the first query in the plurality of query sessions. 13. The system of claim 12 , wherein the first plurality of search entities comprises documents having an associated length of time that satisfies a threshold, wherein each length of time represents how long the respective single user viewed each document after selecting the document.