There's definitely been a lot of talk about the whole "pay us and we can make that bad review from someone who wasn't your customer just go away." Some say that never actually happened, and yet I was IT support for a small business who contacted Yelp to find out why non-customers were allowed to leave bad reviews and they were directly told that for a fee those reviews would be removed.

Sorry, I just realized I crossed up my evil businesses. Yelp did the whole protection-racket thing, it was LinkedIn that hacked people's computers and keep sending out emails in their customer's names ("I heard about this great company, you should check them out...").