19. The non-transitory computer-readable medium of claim 18 , wherein the identifying comprises retrieving the content item based on at least the portion of the first textual identification string from the knowledge database.
19. The non-transitory computer-readable medium of claim 18 , wherein the identifying comprises retrieving the content item based on at least the portion of the first textual identification string from the knowledge database. 20. The non-transitory computer-readable medium of claim 19 , wherein the identifying comprises retrieving a second textual identification string of the at least one textual identification string from the knowledge database based on the retrieved content item.