Alphabet Inc.’s Google, Facebook Inc., and Twitter Inc. will testify next week before a U.S. Senate panel on efforts by social media firms to remove violent content from online platforms.

The hearing “will examine the proliferation of extremism online and explore the effectiveness of industry efforts to remove violent content from online platforms. Witnesses will discuss how technology companies are working with law enforcement when violent or threatening content is identified and the processes for removal of such content,” the committee said.

Facebook’s head of global policy management Monika Bickert, Twitter public policy director Nick Pickles and Google’s global director of information policy Derek Slater are due to testify.

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