Personally, I'd assume that any Facebook pages saying "join with us in the glorious people's armed revolution" were set up by the government to catch particularly stupid people.
I think that you are underestimating mankind's stupidity.
I mean, unless I'm wrong and some countries have recently decided to solve all their international conflicts or internal elections by counting the number of facebook fans they have.
Hungary is a good example of that. A contraversial media law which can be used to curtail freedom of speech was passed by the government recently. An FB page was setup by those who are against it. In response the government setup its own page for the supporters of the law. The government is determined to have more fans of the page. And it seems that the government truly believes that if they get more FB fans then the law is justified.
No offence but that scenario would never happen in AU. Good efforts will be made to rebuild, just as they have been in every previous disaster (Australia is pretty accustomed to major floods, cyclones and fires).
Long live the aussie mateship!
"Well, it don't make the sun shine, but at least it don't deepen the shit." -- Straiter Empy, in _Riddley_Walker_ by Russell Hoban