33. The non-transitory computer-readable storage medium of claim 19 , wherein: determining the first association is based on user-activity with respect to the first searchable source; determining the second association is based on user-activity with respect to the second searchable source; wherein the first modified query comprises one or more keywords derived from user-activity with respect to the first searchable source; wherein the second modified query comprises one or more keywords derived from user-activity with respect to the second searchable source.
19. A non-transitory computer-readable storage medium storing instructions for handling queries, wherein the instructions include instructions which, when executed by one or more processors, cause the one or more processors to perform the steps of: storing associations that indicate how to modify user-submitted queries that are to be sent to a plurality of searchable sources; wherein the associations include a first association between a first modification, one or more keywords, and a first searchable source; wherein the associations include a second association between a second modification, the one or more keywords, and a second searchable source; after storing the associations that indicate how to modify user-submitted quires, receiving a user-submitted query, comprising the one or more keywords, to be sent to the plurality of searchable sources; in response to receiving the user-submitted query, performing the steps of: generating a first modified query to be sent to the first searchable source of the plurality of searchable sources; wherein the first modified query is generated by adding a first additional text to the user-submitted query based on existence of the one or more keywords in the user-submitted query and the first association; generating a second modified query to be sent to the second searchable source of the plurality of searchable sources; wherein the second modified query is generated by adding a second additional text to the user-submitted query based on existence of the one or more keywords in the user-submitted query and the second association; wherein the first association is different than the second association; and wherein the first modification is different than the second modification; wherein the first searchable source is separate from the second searchable source.