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> Australian authorities have ordered five websites to remove extremist content or face prosecution
And who is to determine what constitutes extremist content? 
>  chief executives sent to prison, if they fail to remove 'abhorrent' or 'extremist' material.
So the onus is on the webmaster so that paid shills can poison the content of a web site to take it down. They can't go after the shills because: 
> All of them are based overseas.

Orwell would be proud.