In this April 18, 2017, file photo, Facebook CEO Mark Zuckerberg speaks at his company's annual F8 developer conference in San Jose, Calif.
In this April 18, 2017, file photo, Facebook CEO Mark Zuckerberg speaks at his company's annual F8 developer conference in San Jose, Calif. Noah Berger AP
In this April 18, 2017, file photo, Facebook CEO Mark Zuckerberg speaks at his company's annual F8 developer conference in San Jose, Calif. Noah Berger AP

Families of terror victims pressure Facebook, Twitter and Google on extremist content

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