If you're killed in Facebook, do you die here?
Thankfully in this case we're all like Neo and the answer is no.
Personally, I think that it is beyond great that places like Facebook provide a safe place where real people - not their incompetent (or worse) government representatives - can talk and see how similar we all are in our ambitions and dreams, fears and anxieties. That may sound like pie in the sky idealism to some of you, but I think Zuckerberg is right when he talks loftily about the ability for the massively peer-to-peer Web to break down artificial barriers.
Here's the thing. On issues like the Middle East, people are going to say things that offend others. And some patently offensive things will probably also be said. But, within the bounds of the law (so barring threats, etc) they need to be allowed, because they are real. Just like American hip hop music, though sometimes offensive, needs to be protected because it is an important window to the unvarnished feelings of many real people.