London (MOL): Facebook, Google and Twitter have a ‘social responsibility’ to take terrorist propaganda offline, David Cameron warned yesterday, as he unveiled new measures to block jihadist material on the internet. In a speech to the Australian parliament, in Canberra, the Prime Minister said the West faced a ‘new and pressing challenge’ in filtering out extremist propaganda designed to radicalise impressionable youngsters in this country.

British police and intelligence experts are already removing an astonishing 1,000 extremist images and videos a week from the Internet – equal to one every 10 minutes. Of these, some 80 per cent relate to jihadist activities in Iraq and Syria. But Mr Cameron said leading internet firms also had a ‘role’ to play. ‘In the UK we are pushing companies to do more, including strengthening filters, improving reporting mechanisms and being more proactive in taking down this harmful material,’ he said. ‘We are making progress but there is further to go. This is their social responsibility. And we expect them to live up to it.’ His comments came as Downing Street announced that several major internet companies have now signed a deal to make it easier to taken extremist propaganda offline.