This is “watered-down legalese that means nothing,” said Andy Sellars, a fellow at Harvard Law School’s Cyberlaw Clinic, calling it a free speech issue. Defamation — which comprises a false statement of fact, made knowingly, that can be proven to cause harm — is already a civil wrong, thus rendering the clause in Grill 225’s policy unnecessary and “profoundly stupid,” he said.“If I said the service was terrible — ‘terrible’ is an opinion, you can’t sue someone for that,” he said, noting that a quick scan of Grill 225’s Yelp reviews show them to be quite opinion-laden. “Very few reviews would actually be defamation.”

Source: Could a negative Yelp review lead to a lawsuit? – The Boston Globe