On Sept. 10, I found myself watching a scene I never thought I’d witness in Nepal. Not on television, not via state broadcasters, not even on the YouTube channels of established media outlets, but on a Facebook Live stream. Tens of thousands of Nepali youths had convened on Discord — a platform better known for video gamers than for governance — to choose who should lead the country as prime minister. For two days, the streets of Kathmandu and dozens of Nepali cities had been roiled by ...