Yelp has built it's reputation on people not being able to buy their way out of bad reviews.
PD
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I read about this and the lawsuit.
While Yelp reviews are heavily gambled, there are many bad merchants who like to get back at Yelp and lying just as many of the scammers who abuse the site.
But in fact I have found great businesses using it.
Key things to watch out:
1. Fine the businesses who buy reviews: those are usually with an unusually high number of reviews. Many of the reviews will be of people with few reviews to their credit.
2. Find out if a review is fake the way it's written. Common sense helps. If you paid for a service, would you overflow in gratitude and thank the business passionately? Of course not. For me those fake reviews have a blinking light to them like an error code in star diagnostics (P0001 - fake review

) . Any review that is just enthusiastic and contains to factual information why the poster is satisfied will be discarded.
3. Check negative reviews. Often there are good hints. Again: common sense will show you if the negative review is real - or placed by a hateful competitor - or placed by a complainer. There are people with a majority of negative reviews who complain about anything. A good negative review gives you the facts. I have been warned away from many a dealer and repair shop by a good, factual negative review.
4. I usually have 1 to 2 negative and 3 positive reviews that I find interesting and factual and disregard the rest.
5. Then go there and see what your impressions are.
If you read Yelp more like literature than a factual report you can find the good businesses. I found great businesses before.
My current Indy had only about 25 reviews over the past 10 years, and the negative reviews were about him being grumpy to people who were - I think - not courteous. Because to me the mechanic was very good and I'll get him my maintenance business.
PS: I also read the "reviews currently not recommended" to round out the picture.