This morning, Rachel Catania, a student at Marjory Stoneman Douglas High School in Parkland, FL, and a survivor of the recent shooting, was asked on the air if she was a crisis actor or a plant. It was a staggering moment of television and a sign of just how quickly conspiracy theories pushed by pro-Trump media can go mainstream. How did this happen? Conspiracy theories following mass shootings are usually born on online message boards 8chan and 4chan and spread like wildfire on social media.