User blog comment:John Breasly/Warning, approaching spammers/@comment-5000017-20111001180052

that lewdness, obscenity, libel, profanity, and fighting words are unprotected expression because “such utterances are no essential part of any exposition of ideas, and are of such slight social value as a step to truth that any benefit that may be derived from them is clearly outweighed by the social interest in order and morality".