The kind of disinformation now known as fake news has tainted public discourse for centuries, even millennia. But it’s been amplified in our digital age as a weapon of fearmongers, mob-baiters and election-meddlers that can widen social fissures, undermine democracies and bolster authoritarian regimes. Shelly Banjo writes in the Washington Post that as voters in some of the world’s most-populous countries headed to the polls in 2019, governments began to respond. Companies such as Facebook, Twitter and Google have come under increasing pressure to take action.