David Hogg, 17, went from Florida high school student to mass shooting survivor to telegenic advocate for gun-control laws in a few days. And just as quickly, online conspiracy theorists began spinning viral lies attacking the teenager’s credibility.

By Wednesday — a week after a gunman wielding a semiautomatic rifle killed 17 people at Hogg’s Parkland, Fla., school — online media sites including YouTube swelled with false ­allegations that Hogg was ­secretly a “crisis actor” playing the part of a grieving student in local and national television news reports.
https://www.washingtonpost.com/business/technology/how-a-survivor-of-the-florida-school-shooting-became-the-victim-of-an-online-conspiracy/2018/02/21/d54083a0-172e-11e8-b681-2d4d462a1921_story.html