We aren't using the IRC chat any longer, I believe.
As far as private IP's... sure, they aren't private, but publishing them leaves the person open to attack, because you can glean enough information form reading posts on a forum like this to direct an attack on someone. Say, for instance, you post a thread that you are having a problem with your dsl. Say that elsewhere you post a thread that advertises your personal website, and elsewhere you post that you are having trouble with your IIS server mapping through your firewall at home. If your IP was logged, I wouldn't have to do any work to find you and exploit IIS because you essentially gave me directions to your "house"..
That's why we shouldn't publish IP addresses. We don't need to be a lookup tool for hackers.