Facebook cannot be the arbiter of facts and truth. IMO people are assigning way too much power to facebook. Everyone knows Facebook is just the national enquirer of the internet--no one really cares what shows up there.
The reason censorship is flawed is not that everything is true--it's that handing over the power to censor has never turned out well.
Was Obama lying when he said 'if you like your healthcare, you can keep it'? Well, it depends on who you ask and your interpretation of that, but he later apologized for the remark.
Don't be so quick to call for a revolution, lest you find yourself at the pitchfork's tip.