Now no real names are mentiomed, so my question is (Michael, maybe you have experience of this?) does it only count as libel if the person's real identity is known/mentioned (as opposed to just the forum username)?
My personal thinking is that you cannot libel a username or internet handle/nickname if the real person behind it is not generally known or associated with it in such a way that it would be widely damaging to them as an individual (celebs obviously would, Mike Trenton [who?] would not).
Oh, and I appreciate the law here in the UK may differ from elsewhere, but if anyone has any experience or can advise on libel in general it would be appreciated.