Always..! the old saying 'sticks and stones can break my bones but words do nought to hurt me' applies here.
There will always be haters and refuskniks and those manipulating the truth or just telling downright lies for gain or for spite. In order to achieve progress in this area effort would be much better spent on teaching the young the old rhyme and instructing them on how to ignore the haters or the spiteful. The most effective way to deal with this is always to ignore it. The problem with the law is that on all sides are professional liars - the individual can never win in this arena.
There is an old Chinese saying;-
'you cannot do good business with bad people'
so if you work for someone who removes you on hearsay and unsubstantiated lies you have to ask yourself were they ever good people. On the other side of the coin are public representatives and those working for the people. The internet is a remarkable tool for the spread of knowledge and information about life, about how to live. Any form of censorship of the internet will inevitably be skewed to protect those in power who have things to hide and so must be resisted at all costs.