9. The computer-implemented method of claim 7 , wherein the review subset is selected from the larger set based on a sampling rate.
7. The computer-implemented method of claim 2 , wherein the plurality of media items defines a review subset of a larger set of media items, and the method further comprises calculating a normalized score for a first media item based on the normalized score formula, wherein the first media item is contained within the larger set of media items, but not within the review subset.