13. An article comprising one or more machine-readable data storage media storing instructions operable to cause one or more machines to perform operations comprising: estimating a breadth of a search query; identifying user interaction with a first document in a result set that is responsive to the search query; changing a ranking of a popularity of the first document based at least in part on the user interaction with the first document and the breadth of the search query, wherein an amount of the change in the ranking of the popularity decreases with increased breadth of the search query; and making the ranking of the popularity of the first document available for responding to a subsequent search query.
13. An article comprising one or more machine-readable data storage media storing instructions operable to cause one or more machines to perform operations comprising: estimating a breadth of a search query; identifying user interaction with a first document in a result set that is responsive to the search query; changing a ranking of a popularity of the first document based at least in part on the user interaction with the first document and the breadth of the search query, wherein an amount of the change in the ranking of the popularity decreases with increased breadth of the search query; and making the ranking of the popularity of the first document available for responding to a subsequent search query. 17. The article of claim 13 , wherein changing the ranking of the popularity of the first document comprises weighting the user interaction with the first document based on the breadth of the search query.