Yelp's reviews are probably real, but Yelp also throws out a lot of real reviews, and they do this in a way that will skew the star rating up or down depending

Yelp's reviews are probably real, but Yelp also throws out a lot of real reviews, and they do this in a way that will skew the star rating up or down depending on whether the business purchases Yelp ads. Yelp is actually still great because they have the only good database of what businesses are open at what times.