That’s the opening sentence in a Yahoo News report. The report goes on to say:

The companies will share ‘hashes’ – unique digital fingerprints they automatically assign to videos or photos – of extremist content they have removed from their websites to enable their peers to identify the same content on their platforms.

“We hope this collaboration will lead to greater efficiency as we continue to enforce our policies to help curb the pressing global issue of terrorist content online,” the companies said in a statement on Tuesday. …

YouTube and Facebook have begun to use hashes to automatically remove extremist content. …

The database will be up and running in early 2017 and more companies could be brought into the partnership.

Glenn Reynolds has a typically pithy reaction:

Multibillion-dollar corporations ganging together to silence particular viewpoints — perhaps an antitrust investigation would be in order.