There is an obscure site on YouTube titled "Fake Review Watch". The woman who produces it is a very qualified investigator and she spends much effort documenting fake reviews on Google, Yelp, Amazon and others. The extent of the fraud is hard to believe. I'm fortunate in that Amazon has banned me from posting reviews and has removed all my previous reviews because some criticized poor chinese quality standards and Amazon's complete dependence on china as their biggest supplier. Obviously fake reviews are fine with Amazon as long as they're positive.