I once posted a backdoor password on Usenet. Some guy ripped me a new one, telling me to consider how much damage I had done, letting it out, and that I should cancel my post with my News provider, etc. etc.,

Well, he had a valid point. It was stupid of me to post it. So I canceled it with my news provider (which probably doesn't get most of them off of the news servers), I went to Google and went through a procedure to remove it, which they did.

The funny part of the whole saga is that the guy that ripped me quoted my post in whole, revealing the p/w again, and when that was pointed out to him, he didn't do anything about it himself!!

So we all need to be vigiliant about posting and removing posts that contain passwords.