9. The computer-implemented method of claim 5 , wherein determining a quality score for the review based on the product review data comprises: determining a first sentiment score for the review, the first sentiment score indicative of a type and a magnitude of a sentiment expressed in the review; determining a second sentiment score for the product review data, the second sentiment score indicative of a type and a magnitude of a sentiment expression in the product review data; and determining the quality score based at least in part on the first sentiment score and the second sentiment score.
9. The computer-implemented method of claim 5 , wherein determining a quality score for the review based on the product review data comprises: determining a first sentiment score for the review, the first sentiment score indicative of a type and a magnitude of a sentiment expressed in the review; determining a second sentiment score for the product review data, the second sentiment score indicative of a type and a magnitude of a sentiment expression in the product review data; and determining the quality score based at least in part on the first sentiment score and the second sentiment score. 10. The computer-implemented method of claim 9 , wherein the quality score is determined based at least in part on a difference between the first sentiment score and the second sentiment score.