"Google, Facebook, Twitter and Microsoft have pledged to work together to identify and remove extremist content on their platforms through an information-sharing initiative.
The companies are to create a shared database of unique digital fingerprints – known as 'hashes' – for images and videos that promote terrorism. This could include recruitment videos or violent terrorist imagery or memes. When one company identifies and removes such a piece of content, the others will be able to use the hash to identify and remove the same piece of content from their own network...
Because the companies have different policies on what constitutes terrorist content, they will start by sharing hashes of 'the most extreme and egregious terrorist images and videos' as they are most likely to violate 'all of our respective companies' content policies, they said."
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