1. A computer program embodied on a non-transitory computer readable storage medium containing instructions that when executed by a processor cause a computer to: identify a set of keywords, the set including a plurality of keywords; determine historical activity data indicative of activity previously performed with respect to the set of keywords, including determining for each keyword of the plurality of keywords a portion of the historical activity data involving the keyword; compare the historical activity data to a plurality of predefined thresholds, including for each keyword of the plurality of keywords, comparing at least a threshold predefined for the keyword to the portion of the historical activity data involving the keyword; and automatically perform an action for refining the set of keywords, including removing a keyword from the set of keywords, when a result of the comparison indicates that the portion of the historical activity data involving the keyword does not meet the threshold predefined for the keyword.
1. A computer program embodied on a non-transitory computer readable storage medium containing instructions that when executed by a processor cause a computer to: identify a set of keywords, the set including a plurality of keywords; determine historical activity data indicative of activity previously performed with respect to the set of keywords, including determining for each keyword of the plurality of keywords a portion of the historical activity data involving the keyword; compare the historical activity data to a plurality of predefined thresholds, including for each keyword of the plurality of keywords, comparing at least a threshold predefined for the keyword to the portion of the historical activity data involving the keyword; and automatically perform an action for refining the set of keywords, including removing a keyword from the set of keywords, when a result of the comparison indicates that the portion of the historical activity data involving the keyword does not meet the threshold predefined for the keyword. 15. The computer program of claim 1 , wherein the historical activity data includes data indicative of activity previously performed with respect to the set of keywords within a predetermined period of time prior to a current time.