Ed,
OK, I'm glad you accept the fact that I was not "endorsing or promoting" the links and that you acknowledge I did not have any malicious intentions. With regards to those pop-ups, I definitely did not encounter these! I was using IE 6 on Windows XP in the office when I first noticed the links but I saw no images, pop-ups, or any such material, only very grayed out links (which I did not follow up). This must contribute quite strongly to our difference in opinions, as I certainly would not have posted if I had seen such things!
I suppose I also felt I was contributing to the commentary on the presence of spurious links alone (which were on Mac related sites), and I did not link directly to any pornographic material nor advocate viewing any. Admittedly there was a link-to-a-link, but, honestly without meaning to sound facetious, I begin to wonder where to draw the line. With hindsight, editing out the URL seems OK to me, (especially if those ads were coming up) but giving me a warning seemed a bit harsh as it was all completely innocent; I would have thought something as serious as a warning would be reserved for those who acted with bad intent. As an additional note, the recent thread "dotmac.info" advertises a personal site and I have absolutely no problems at all with this... but it seems to be against the board rules you asked me to check, and yet you personally replied to that post in a very positive manner, rather than giving the originator a warning too. This doesn't seem to be equal treatment.
Finally, I have enabled the PM option as you suggested - I originally switched it off when I first created my account as I misunderstood this to be a system like Microsoft's Messenger. I don't want this thread to digress from the original topic, so I'd like to switch this discussion to PM/E-Mail if that is OK with you. Sorry for the digression everyone.