Facebook, Twitter and Google have 'social responsibility' to remove terrorist propaganda from the internet, says David Cameron In a speech in Canberra, Prime Minister said internet firms had role to play Has been irritation at the slow response of some firms to remove material Mr Cameron said there is 'further to go' in filtering out extremist footage There is already 1,000 images and videos being removed every week By Jason Groves In Canberra For Mailonline In the speech, Mr Cameron said 'there is further to go' in filtering out extremist propaganda online 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. Ministers have been frustrated by the reluctance of some technology companies to join the battle against terrorist material. There is irritation at the slow response of some firms to requests to remove material, along with frustration that extremists find it so easy to publish their propaganda to a global audience in the first place. Intelligence experts believe that slick videos produced by jihadist groups like Islamic State (Isil) and hate preachers play a major role in the radicalisation of British youngsters driven to wage jihad. Mr Cameron said leading internet firms also had a "role" to play in removing extremist propaganda Under the terms of the new deal the major internet service providers have agreed to introduce a "public reporting button" on websites to make it easier for members of the public to raise the alarm about extremist material. BT, Virgin, Sky and Talk Talk have all signed up to the arrangement, which will operate in a similar way to an existing service that allows people to report child abuse images. The firms have also pledged to make their filters more sophisticated to prevent the images ever appearing online in the first place. Google, Facebook, Yahoo and Twitter have also agreed to help smaller industry players "raise their standards" and improve their capacity to deal with the material. The deal followed talks in Downing Street earlier this month between the industry and Cabinet Office minister Jo Johnson. David Cameron is joining world leaders in Brisbane, Australia, for the G20 summit, which begins today But a Government source said ministers believe the industry still has much further to go on the issue. "We will keep pressing internet companies to be more proactive given the scale of the threats and the persistent propaganda from the terrorist groups," the source said. Our message is very clear - as these terrorist organisations are becoming increasingly sophisticated and internet savvy, developing glossy material designed purely to glorify and radicalise as well brutal images of murders and attacks, these internet companies must take responsibility for their role in getting as much of this material off the internet as quickly as possible.