The mainly broke defamation law in USA is Libel law. This law states that if theres any publication that is a false statement or have the idea of harming the reputation of someone is considered ilegal. Opinions most of the time are not being considered defamatory. Some publications take extra work for example in cases of someone being accused of murder or someone being accuse of fraud. in cases of defamation to a celebrity or public figure the cosequences could be really bad depending on how the publication affected his image.
In some cases the jurisdiction can have retraction if your publication was neutral or dint have the meaning to crash someones life.
Because of this type of problems some people have just created what they called defamation insurance, this is mainly used by magazines and news paper editors this insurance can cover up over 1 million dollars per year.
