When Can A Slanderous Facebook Posting Support Personal Jurisdiction? | Low, Ball & Lynch - JDSupra. Other than not wanting others to see us in a negative light, there are reasons why you shouldn't say anything bad about somebody else on Facebook, or anywhere else publicly, for that matter. Expressing a negative opinion about a product is not what I am talking about, either. Any statement that tends to place another in disrepute, or bad character is the textbook definition of defamation. If oral, it is slander. If written (Facebook anyone?) it is libel. Publication to another is required, so a Facebook post is certainly sufficient. In this California case, the issue was jurisdictional. If a Facebook post can be read online by California residents, does this grant California jurisdiction to bring the poster into a California court system to defend the comments? Ouch. While the poster won the case on jurisdiction, the appellate court permitted further discovery on the issue (depositions, etc) Sounds pretty expensive to me. So, unless you want to hire a lawyer in each of 50 states to defend a defamation action, perhaps you should follow mom's advice. Truth may be an absolute defense to a defamation action. But, it can be time consuming and expensive to prove that truth.