As most of the world condemned last week’s mass shooting in New Zealand, a contrary story line emerged on 8chan, the online message board where the alleged shooter had announced the attack and urged others to continue the slaughter. “Who should i kill?” one anonymous poster wrote. “I have never been this happy,” wrote another. “I am ready. I want to fight.”
To experts in online extremism, the performance echoed another brand of terrorism — that carried out by Islamist militants who have long used the Web to mobilize followers and incite violence. Their tone, tactics and propaganda were eerily similar. The biggest difference was their ambitions: a white-supremacist uprising, instead of a Muslim caliphate.