The Counter-Terrorism Internet Referral Unit (CTIRU) was set up in 2010 by ACPO (and run by the Metropolitan Police) to remove unlawful terrorist material content from the Internet, with a specific focus on UK based material. CTIRU works with internet platforms to identify content which breaches their terms of service and requests that they remove the content on a voluntary basis. CTIRU also compile a list of URLs for material hosted outside the UK which are blocked on networks of the public estate.
To date (as of December 2017), CTIRU is linked to the removal of 300,000 pieces of "illegal terrorist material" from the internet.[1]