7. The content delivery system of claim 6 , wherein the first index category in the predetermined hierarchical taxonomy is associated with at least one target term.
7. The content delivery system of claim 6 , wherein the first index category in the predetermined hierarchical taxonomy is associated with at least one target term. 8. The content delivery system of claim 7 , wherein the instructions further cause the processor to: compare the first term to the at least one target term associated with the first index category in the predetermined hierarchical taxonomy; and upon a determination that the at least one target term includes the first term, assign the primary-content source to the first index category in the predetermined hierarchical taxonomy.