6. A system for identifying needy queries for which additional responsive content is needed, the system comprising: a content server configured to provide content items, the content server comprising: a needy query component operative to: receive a query comprising one or more terms; retrieve a plurality of content items identified as responsive to the query, the plurality of content items forming a result set and ranked according to plurality of ranking techniques; determine an amount of the plurality of content items in the result set; generate a score for the plurality of ranked content items identified as responsive to the query; calculate an average of the scores associated with the plurality of ranked content items identified as responsive to the query; determine whether the query is needy based upon the amount of the plurality of content items in the result set and perform a comparison of the calculated average of the scores with respect to a needy query score threshold; wherein the query is determined to be a needy query on the basis of the amount of the plurality of content items in the result set being an inadequate response to the query, on the basis of the calculated average of the scores associated with the plurality of content items failing to meet the needy query threshold; and retrieve additional responsive content items in addition to the plurality of content items in the result set for the needy query.
6. A system for identifying needy queries for which additional responsive content is needed, the system comprising: a content server configured to provide content items, the content server comprising: a needy query component operative to: receive a query comprising one or more terms; retrieve a plurality of content items identified as responsive to the query, the plurality of content items forming a result set and ranked according to plurality of ranking techniques; determine an amount of the plurality of content items in the result set; generate a score for the plurality of ranked content items identified as responsive to the query; calculate an average of the scores associated with the plurality of ranked content items identified as responsive to the query; determine whether the query is needy based upon the amount of the plurality of content items in the result set and perform a comparison of the calculated average of the scores with respect to a needy query score threshold; wherein the query is determined to be a needy query on the basis of the amount of the plurality of content items in the result set being an inadequate response to the query, on the basis of the calculated average of the scores associated with the plurality of content items failing to meet the needy query threshold; and retrieve additional responsive content items in addition to the plurality of content items in the result set for the needy query. 7. The system of claim 6 wherein the needy query component is operative to retrieve plurality of content items ranked according to relevance with respect to the query.