Everyone should read this brief introduction to Internet defamation law. An initial legal question, which arose with radio and television, is whether the communication is spoken (slander law would apply) or written (libel law would apply). Similarly, an issue dating to the introduction of the telegraph is the legal liability of the communication firm. While this question is still being resolved for the Internet, it appears that service providers who monitor content may have greater responsibility. The authors conclude that service providers must provide a clear definition of libel and clearly prohibit defamation.