You agree not to post, email, or otherwise make available Content:
...
w) post the same item or service in more than one classified category or
forum, or in more than one metropolitan area;
Post to the most appropriate community possible. If you're submitting an article about American politics, for example, it would be better suited for /r/politics than /r/worldnews.
“We no longer tolerate multiple instances of the same message. You agree to post your message ONCE to the most appropriate category, and if you are not sure, to post it on the General Discussion Board.”
“and avoiding multiposting, cross-posting, off-topic posting, hijacking a discussion thread, and other techniques used to minimize the effort required to read a post or a thread. ”