14. The non-transitory computer-readable medium of claim 13 , wherein the operations comprise: storing in the result selection logs of the client system, by the tracking component, for each user click made by any of the multiple users of the client system and not by other users of the search engine on a search result presented in response to a search query, (i) the search query corresponding to the user click, and (ii) data identifying the search result corresponding to the user click.
14. The non-transitory computer-readable medium of claim 13 , wherein the operations comprise: storing in the result selection logs of the client system, by the tracking component, for each user click made by any of the multiple users of the client system and not by other users of the search engine on a search result presented in response to a search query, (i) the search query corresponding to the user click, and (ii) data identifying the search result corresponding to the user click. 18. The non-transitory computer-readable medium of claim 14 , wherein the operations comprise: storing in the result selection logs of the client system, by the tracking component, for each user click made by any of the multiple users of the client system and not by other users of the search engine on a search result presented in response to a search query, (vi) titles and snippets of search results presented in a user interface before the search result corresponding to the user click is presented in the user interface.