The New York Times acknowledges that Yelp pays for reviews
The venerable New York Times had to edit and correct a factual error in it's reporting on yelp. In this article the New York Times initially reported quite inaccurately that "it didn't try to pay for reviews, as some sites have."
This was updated with that portion of the article having a strike through.
It didn’t try to pay for reviews, as some sites have.
Having initially denied that yelp paid people to review Jeremy Stoppelman finally admitted that Yelp does in fact use shills to post reviews.