Bangladesh, March 16 -- San Francisco, Mar 16 (AP/UNB)- The suspected New Zealand shooter carefully modeled his attack for an internet age. He live-streamed the massacre, shouted out a popular meme slogan and published a long, rambling manifesto replete with inside jokes geared for those steeped in underground internet culture.

All that makes Brenton Harrison Tarrant, the man charged with murder for the attack Friday on mosques in Christchurch, the latest person to allegedly commit mass slaughter alongside a targeted appeal to online communities that breed extremism.

Prior to killing six people in Isla Vista, California, in 2014, Elliott Rodger posted an online video and circulated a lengthy document full of grievances. He was later fou...