7. A non-transitory medium storing instructions that, when performed by one or more computers, cause the one or more computers to perform operations comprising: identifying queries that each include (i) one or more first terms that are associated with a particular topic and (ii) one or more second terms, different than the one or more first terms, that are associated with a particular author; identifying web resources for which the particular author has been identified as an author; determining a quantity of selections of search results that (i) are generated in response to one or more of the queries and (ii) reference one or more of the web resources for which the particular author has been identified as an author; associating the particular author with the particular topic, as a topic-to-author association, when the quantity of selections satisfies a threshold that is associated with more than one selection; and using the topic-to-author association in ranking a search result, which references one or more of the web resources, that is generated in response to one or more subsequently received queries that includes one or more of the first terms that are associated with the particular topic.
7. A non-transitory medium storing instructions that, when performed by one or more computers, cause the one or more computers to perform operations comprising: identifying queries that each include (i) one or more first terms that are associated with a particular topic and (ii) one or more second terms, different than the one or more first terms, that are associated with a particular author; identifying web resources for which the particular author has been identified as an author; determining a quantity of selections of search results that (i) are generated in response to one or more of the queries and (ii) reference one or more of the web resources for which the particular author has been identified as an author; associating the particular author with the particular topic, as a topic-to-author association, when the quantity of selections satisfies a threshold that is associated with more than one selection; and using the topic-to-author association in ranking a search result, which references one or more of the web resources, that is generated in response to one or more subsequently received queries that includes one or more of the first terms that are associated with the particular topic. 12. The medium of claim 7 , wherein the threshold comprises a threshold proportion of the quantity of selections to all selections of search results generated in response to one or more of the queries.