Answer: Not in the United States. Under 47 U.S.C. sec. 230(c)(1) (CDA Sec. 230): "No provider or user of an interactive computer service shall be treated as the publisher or speaker of any information provided by another information content provider." This provision has been uniformly interpreted by the Courts to provide complete protection against defamation or libel claims made against an ISP, message board or chat room where the statements are made by third parties. Note that this immunity does not extend to claims made under intellectual property laws.