Since the conversation here was about copyright, the whole private/ public issue is irrelevant. Copyright is about the rules for material available publicly in some form, and when it is right to copy it.
By noise I meant that these sites too lazy to come up with their own content cannibalize the Usenet forums - because if someone does a websearch for a info on a '76 Dr Fischer Ockfener Bockstein Auslese, they find dozens of copies of CWDJRXYZ's TN, and there's very little chance any response they make is seen by the author. They are led to believe that he posted on that forum. It's sad because it helps kill Usenet, a rather noble platform for the exchange of ideas IMHO.
Out of curiosity, do you like wine? Or are you posting from a position of self-interest?