Posting the same message more than once is a violation of the guidelines, as is reposting information from a locked thread.So...if you've posted a message as a reply to a thread, do not start another thread with the exact same information.
Show some courtesy for your fellow posters by not repeating yourself. Say what you want to say once. If there's already a discussion going about a topic, say it within that discussion instead of starting another thread about it.