1. A method for identifying needy queries for which additional responsive content is needed, the method comprising: receiving a query comprising one or more terms; retrieving one or more content items identified as responsive to the query, the one or more content items ranked according to one or more ranking techniques; generating a score for the one or more ranked content items identified as responsive to the query; and determining whether the query is needy based upon a comparison of the one or more scores associated with the one or more content items identified as responsive to the query and a needy query score threshold.