YELP is the paid shilling site. I knew it for a while, and the rumors and testimony have been there, but until I saw it done to me, I gave them the benefit of the doubt. I don't give them that anymore.
Yes as other reviewers have pointed out, they take out negative reviews for bogus reasons often citing "objectionable" or "personal" feelings for taking the review of a bad business or bad person out. Case in point, I wrote a review for James Kosnett i. E. of the legal firm Kosnett and Durchfort that he was a fraudulent lawyer. He was supposed to represent me in my case against the university but showed no work whatsoever. I even took this to the state bar which equally covered this up, and couldn't prove he did any work on my case (gotta love paid shillers).
I called him a fraud because he was a fraud in my review, and then I saw that he was posting fake reviews for himself at Avvo (another paid shilling site) to pad his bad ratings. So in other words, I posted facts, and there was no reason for Yelp to pull my review.
However, YELP took its shilling action to fraudulent action. They marked the business as "closed" on the site, so no know could review the fraudulent lawyer. Kosnett and Durchfort ARE NOT closed at all. James Kosnett and his fraudulent firm are open 365 days a year to scam another unsuspecting victim who is unaware of how bad the lawyer is.
YELP committed fraud here, so that's how bad YELP is. I saved all my reviews including the Kosnett review and have begun posting them on Youtube. I have not been legally threatened by Kosnett for outing him as a fraudulent lawyer because he is one.
I will be able to gain more views, and even monetize my reviews on Youtube, so anyone thinking of joining YELP should join Youtube. I never had any problems with them, and they have never yanked a review for bogus reasons like YELP.