Contrary to popular belief, tweets are generally not copyrightable the same reason that catch slogan or advertising gimmick is not copyrightable — it is a short phrase, by definition, is not able to be copyrighted by the U.S. Copyright Office. The more interesting quesiton is whether it is otherwise protected–maybe. Trademark laws have been used to protect advertisement slogans, why not tweets if established in the marketplace as a distinct mark?