I think it works like this - someone tells you something about somebody else that isn't true and is defamatory - that's a libel (or maybe a slander, I can never remember). You then make a post saying what you were told. You post tells the truth - i.e. it is true you were told what you say you were told, but nonetheless it repeats the false libel - which has now been published. And it's the publisher (Accyweb), not you, who is held legally responsible and can be sued - which is why Accyweb has to have people like Stanleymad doing her thankless job and getting slagged off for doing it properly.
(And the disclaimer in Macca's signature about everything he says being opinion and not necessarily fact is a good line but doesn't change the legal situation or protect Accyweb in the slightest
)
Now I'll wait for someone who really understands this to put me right
