I want to sue the person who posted vicious lies about me on Facebook.

Contact Facebook and file an incident report for investigation. Communicate your concerns to parties and Facebook and follow up in writing. Defamation laws differ from state to state. Consult a local attorney your facts and evidence to determine your rights.Libel is a written or broadcast defamatory false statement that are damaging to a person's reputation. It is a civil wrong (tort) and can be the basis for a lawsuit. On your fact pattern - someone posts on internet to one or more persons an false statement about you, and that false statement is harming your reputation. Truth is a defense for defamation. Document everything in writing to create a clear record and evidence of your efforts. If you have proof to corroborate your facts and circumstances - records, text messages, video, witnesses - keep them available on hand - as proof of falsehood. That is evidence and helpful to you cause.

Not a legal question, but a request for a defamation lawyer, so use 's lawyer finder tool.

There is a possibility of filing a civil suit for libel against the person making the Facebook posts, but you need to discuss it with an attorney. Your damages might be so minimal that it does not justify pursuing a civil suit. The person might also be broke, which makes the filing of a civil suit pointless. You can also consider seeking a civil harassment restraining order against the person, which may help put a stop to the posts. Best of luck.