A false statement of fact about someone, communicated to others, that damages their reputation; libel is written or published, slander is spoken.
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Defamation is a false statement of fact about an identifiable person, communicated to at least one other person, made with the degree of fault the law requires, that harms the person's reputation. Written or otherwise published statements are libel; spoken ones are slander. Ordinarily a slander plaintiff must prove a specific money loss, but certain statements are slander per se and need no such proof: falsely accusing someone of a serious crime, of having a loathsome disease, of serious sexual misconduct, or of conduct incompatible with their business or profession.
The statement must be one of fact. There is no blanket exemption for anything labeled "opinion", but a statement that cannot be proved true or false, or that no reasonable listener would take as a literal assertion of fact, is protected (Milkovich v. Lorain Journal Co., 497 U.S. 1 (1990)). Truth is a complete defense, and a statement that is substantially true is treated as true even if minor details are wrong (Masson v. New Yorker Magazine, Inc., 501 U.S. 496 (1991)).
The First Amendment sets the fault standard. A public official or public figure must prove "actual malice", meaning the speaker knew the statement was false or recklessly disregarded whether it was (New York Times Co. v. Sullivan, 376 U.S. 254 (1964); Curtis Publishing Co. v. Butts, 388 U.S. 130 (1967)). A private person may recover on a lesser showing that each state sets, at least negligence, but presumed or punitive damages still require actual malice (Gertz v. Robert Welch, Inc., 418 U.S. 323 (1974)). Online, the platform that hosts someone else's post is generally not treated as its publisher (47 U.S.C. § 230(c)(1)); the person who wrote the post remains responsible for it. Many states have anti-SLAPP statutes that let a defendant seek early dismissal of a suit aimed at speech on a public issue, often with attorney's fees if the defendant wins.
Save the statement exactly as it appeared, with the date, the place it was published and who saw it, and write down any money or work you lost because of it. Talk to a lawyer before you respond publicly or send a demand, because the limitation period for defamation is short in most states, some states require a retraction request before suit, and a suit over speech on a public issue can trigger an anti-SLAPP motion that makes the person who sued pay the other side's fees. Anyone who has been threatened with a defamation suit should get advice too, since truth and opinion are defenses that depend on the exact words used.
Worried about the cost? A lawyer can be hired for one part of a case only (limited-scope representation), may be paid from what a claim recovers (contingency fee), or may be free through a pro bono program or legal aid; a court can also waive its own filing fees.
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