Andrew Caballero-Reynolds/AFP/Ritzau Scanpix. (FILES) In this file photo Facebook founder Mark Zuckerberg speaks at Georgetown University in a ‘Conversation on Free Expression” in Washington, DC on October 17, 2019. – Facebook chief Mark Zuckerberg has defended his decision not to interfere with posts by US President Donald Trump, US media reported, after the social media giant’s hands-off policy sparked outrage and prompted some employees to quit. Social media platforms have faced calls to moderate the president’s comments, most recently because of the unrest gripping America in the wake of an unarmed black man’s death during arrest as a white policeman knelt on his neck. (Photo by ANDREW CABALLERO-REYNOLDS / AFP)