Christchurch

Guests and members of the public look on during a National Remembrance Service at Waitangi Park on March 29th, 2019, in Wellington, New Zealand.

Communities across continents held vigils, protests, moments of silence, and prayer services.

Facebook and YouTube rushed to remove violent videos. An expert discusses why we need a "reckoning" for online content moderation.

In Twitter responses to a Paris terrorist attack, shared sadness gave way to expressions of solidarity.