New Zealand attacks expose how social media can be launchpad for terror

The grainy footage looked like a violent video game -- a first-person view of bodies piled on the floor as a long-barreled gun sprays bullets across a room. Only this was real life. Brenton Tarrant strapped a GoPro camera to a helmet to capture the carnage he wrought inside Masjid Al Noor in Christchurch, New...