There are three kinds of review site: 1. The ones unable to effectively police shills and spam. I'd put Google in that bucket. 2. Those that turn a wilful bli

There are three kinds of review site: 1. The ones unable to effectively police shills and spam. I'd put Google in that bucket. 2. Those that turn a wilful blind eye to review fraud, as long as they boost sales, like Amazon 3. Those like Yelp or Glassdoor whose entire business model is built around extortion and a protection racket ("nice business you have here, it would be a shame if a bad review happened to it. Unless you buy ads with us, of course").