There is a thin line between just stating your opinion and being allowed to slander someone. The thing is there are so many bullies out there that if you just allow people to say whatever they want then you will end up with so many false reports as though there isn't enough of that on the internet.
I'm looking forward to more stringent laws being enacted to curb the loose way in which people can slander just about anything or anyone and get away with it with no consequence at all. The net needs to be seen and treated like any other form of public media.
I think anyone should be able to say what they want about an issue but not about a person. There is a distinct difference between let's say debating higher taxes and saying a senator that is pushing the idea is a moron.
Its more a matter of making sure what you say is stated as opinion and not simply slander because you think its 'cool'. People go as far as making serious threats against others and expect to be untouched. A threat is a threat no matter where you say it: social network, blog, forum or even in a private chat.