They allow evil customers with perverted views to review some well meaning businesses and destroyed them for good. Yelp, on the other hand also kept soliciting companies to pay them under the premise of advertisement but if companies wouldn't budge, they will either keep harassing (5-10 phone call a day to companies for advertisement with them. If that's not excessive, I don't know what is), or allow negative reviews to fester and rise to top pages of review sites. They also allow companies to buy their reviews from elite reviewers to give an otherwise very mediocre company an edge over great ones. So, buyers beware. Don't read too much into their reviews!