https://www.scientificamerican.com/article/researchers-model-online-hate-networks-in-effort-to-battle-them/

The Christchurch mosque shootings, which left 51 dead and 49 injured on March 15, were a modern-day horror by any measure—from the pain and suffering of the 100 victims to the agony of their hundreds of family members and friends and the howls of grief and outrage from a wounded city and country. Now, as if all that were not nightmare enough, George Washington University researcher Neil Johnson and his colleagues point out in a new paper that, in the sum of its details, the Christchurch massacre epitomizes the border-defying complexity of what they call “online hate ecology,” the global networks that link groups of neo-Nazis, white supremacists and other extremists.

In this case, Johnson and his colleagues explain in the paper, the man charged in the attack is Australian, the shootings took place in New Zealand, and the guns were covered in “messages in several European languages on historical topics that are mentioned in online hate clusters across continents.” Those topics included historical defeats of Islamic forces at the hands of Europeans.