Re: Yelp
Yelp is a pseudo "user review" site, which claims that they list reviews of merchants from real users.
Until you read their disclaimer
http://officialblog.yelp.com/2009/10/why-yelp-has-a-review-filter.html
where they openly admit that they hide reviews from any source they don't like, that being any reviewers they have even the slightest doubt of. Read: not towing the Yelp party line of writing reviews that benefit Yelp through paid company participation
http://www.searchenginejournal.com/yelp-filter-positive-reviews-business-refuses-pay-advertising/98695/
Biting the hand that feeds IT
