For a few hours on Monday, the relentless stream of conspiracy memes, thirst traps, and LuLaRoe pitches went silent. Facebook went unconscious. Meanwhile, a whistleblower prepared to testify in front of the Senate about what exactly Facebook knows about the problems it causes. Virginia Heffernan talks to journalist Steven Levy about what's going on and media scholar Siva Vaidhyanathan about what's next.