I helped develop a Yelp-style site for the UK market, and you'd be surprised how often businesses review themselves and review their rivals negatively, it's a p

I helped develop a Yelp-style site for the UK market, and you'd be surprised how often businesses review themselves and review their rivals negatively, it's a pretty common practice. We tried to curb this by letting businesses reply to reviews and control their listing details, but they still come along and blatently review themselves!