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I agree, though the other issue for smaller places is that they are more susceptible to review-bombing by one disgruntled party (do we really need 6 reviews from 6 different people about how the same table had to wait an hour to get the check one time?) or "5 stars for 30% off" incentives (which I have unfortunately seen a number of, especially at small businesses trying to distinguish themselves).

Google Maps I still don't understand where they get a lot of reviews from in the first place. While some look like normal reviews, there's a lot that have no comments at all or comments completely unrelated to the place ostensibly being reviewed (or just cryptic things like "not good" or "good"). It's not a bad comparison to use alongside Yelp, but it's definitely led to more clunkers, especially for places with n<20 reviews.