Experts say that more companies from wedding photographers to dentists are slipping non-disparagement clauses (and other language that prevents consumers from writing negative reviews) into the fine print almost no one bothers to read. Consumers who violate these policies may be sued and fined — even if the complaints are 100% true.
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http://teapartyeconomist.com/2014/03/21/non-disparagement-clauses-can-reduce-citizens-free-speech/