The UK government aims to extend the existing system that monitors and orders Internet Service Providers to block internet sites of child pornography to include the monitoring and blocking of “content deemed too dangerous for online pubilcation”.
This raises “freedom of speech issues,” said one source. And, “There is always a concern about mission creep,” said a second ISP source. “When it comes to incitement it’s not as clear cut as child exploitation.”
“Policing the internet is shifting from a reactive process, where authorities are alerted to illegal content, to a proactive one, where public funds could be spent seeking out banned material.”
http://www.theguardian.com/uk-news/2013/nov/27/ministers-order-isps-block-terrorist-websites