…unless your goal is to make your own business fail.
See, there’s a moving company working under a particular name who was in my estimation dishonest and unprofessional with a customer. The customer’s family posted a review on Yelp, then the company — what’s the phrase? — lost its effing mind and threatened to sue the customer for libel.
A couple things I’d like to point out:
1) it’s not libel if it’s true
2) a bad review is good feedback: it shows you how you can improve
3) threatening customers is a poor way to improve your sales
4) having fake reviews written is generally unwise — the internet will find out
5) it’s a good idea to understand Wheaton’s Law
the rest of me 
There is so much truth to this short post. Nice, Neat and Compact.