The laws for proving libel or slander vary from state to state, but there are four main things to look for: The statement must be false, damaging, reckless and public. If you decide to sue, you have to provide proof of these four things. This would usually mean having copies of the original article, social media feed, news broadcast or other place that spread falsehoods about you or your business. You would also have to show how the negative comment harmed you, perhaps by costing you your job or making your business lose customers.