I deleted this thread and started again because I realised there was a misspelled word (one of my cardinal rules is to adhere to good spelling and grammar) in the title and I couldn't change it.
Unfortunately deleting took TP's reply with it so here is his reply;
I guess the fact is that they aren't private.
But neither is e-mail. If the recipient is going to post up your PM then what's to stop them from posting up your e-mail in the same manner?
E-mail won't be read by WT/MT though, unless you send it to them or the recipient forwards it on.
Oh the wicked webs we weave ....