Should journalists use images of tragedies from Facebook and Twitter?

Immediately after the Brussels attacks earlier this week, journalists were being criticized for asking people on social media if they could use their photos and videos of the attack. Martin Belam writes that the attacks this week highlight an ethical dilemma for journalists: While there’s a public interest in using those images, should journalists contact people near an attack on social media to ask for permission to use their images? Belam writes: “Asking to re-use pictures of tragic events is in some ways the digital equivalent of the old newsgathering ‘death knock.’ But now it is a death knock that everybody can listen in on.”