After reading much of what is on here, what we have to realise is that we all have certain rights. Libel, slander, and defamation were not actionable except for the ruling classes or nobility until the last few centuries, but in any case, we do have defenses against such things. These are not criminal or statutory offenses but torts. Damages are assessed by judges, and in some cases judges have ruled ruled against defendants and awarded plaintiffs the princely sum of $1 where actual monetary damage was negligable.
It is still the plaintiff's burden of proof when action is taken. Even though the internet and these forums are supposed to be anonymous, I still would like to feel secure in the belief that if someone libels or defames me specifically, and causes damage, I can still find out who it was and seek restitution. Again, many things are not actionable, and thankfully most jurists in this country are very quick to toss out dubious nuisance law suits, (much unlike our American cousins).
As a former union rep I had to take a wee,(large) bit of public relations and legal training, (don't say sh*t even if your mouth is full of it), there are many things that can land you in a world of hurt, and rightfully so. Publicly reporting someone's professional incompetence or ineptitude is a really good way to find yourself in a civil suit, with the real possibility of very large payroll deductions as a result. Personal attacks carry less of a potential penalty,but... Proof or truth is the best defense in all but Human Rights Commission tribunal cases, but that is a discussion for a different thread.
I like the anonymity of this forum, I can write somewhat freely, though I still have to be careful of what I post because I am still bound by certain confidentiality agreements and such, and still have the candid "don't leave yourself open to civil action" mindset. Though I do push some boundaries.
Posting your opinion is one thing, but posting something as fact, with a person specifically identified, that person should have the right to face their accusor, a right recently lost for those charged with sexual harassment, (which will probably end up as a constitutional challenge, again), and don't get me started on that one.