| http://www.w3.org/ns/prov#value | - Amazon, Yelp and other sites have offered histograms to show not just the raw quantity of reviews, but the way in which reviewers mark a book, restaurant or service across a possible number of stars. (This can lead to perverse consequences: Babbage's plumber, for instance, with 30 five-star reviews on Yelp, cannot keep up with phone calls, leading to unhappy customers.)Amazon's review histograms a
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