All coverage
Christchurch killer's livestream: Facebook reveals viewer numbers, responds to critics
By Chris Keall
New Zealand mosque shooting: Facebook, YouTube trying to rein in footage of New Zealand mosque shooting
By Mark Serrels
Facebook Admits Mosque Shooting Video Was Viewed At Least 4000 Times
By Matthew S. Schwartz
Facebook, YouTube and Twitter go to extraordinary lengths to take down mosque massacre videos
By Lauren Feiner