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Yelp, TripAdvisor: Inside the ratings game

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Yelp, TripAdvisor: Inside the ratings game

“It’s not an easy problem,” says Ryan Radia, associate director of technology studies at the Competitive Enterprise Institute, a think tank in Washington, D.C. “If the writer's talented enough, and not doing 100 reviews a day, most of the [fraudulent reviews] are hard to distinguish.”