(Bloomberg) — Big technology companies have added the digital signatures of 40,000 terrorist videos and images to a shared database as they seek to keep extremist content off their platforms.
Facebook Inc., Google’s YouTube, which is owned by Alphabet Inc., Microsoft Corp., and Twitter Inc. revealed the numbers in a joint blog post Monday.
The four big social media companies, which are part of a group called the Global Internet Forum to Counter Terrorism, announced one year ago that they would begin sharing digital fingerprints – known as hashes – of videos they removed from their platforms for terrorism.
Under the initiative, if a company removes a piece of content from its network for violating policies around terrorism, it is logged in the shared database. Then, if someone tries to post the same content to one of the other participating social networks, the content is automatically flagged for review – usually by a human analyst – and possible removal.
Technology companies have been under increasing pressure from Western politicians to do more to tackle terrorist propaganda and recruitment online. British Prime Minister Theresa May has been particularly active in accusing tech companies of not doing enough to keep extremists off their platforms and has called for international regulation to force the companies to do more or face substantial penalties.
The companies, for their part, have recently been highlighting their progress in using artificial

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