The consensus is that the Brazilian 2018 election was run by social media. The frontrunner — and probable winner — Jair Bolsonaro has campaigned from a hospital bed and has refused to take part in any debate with adversary Fernando Haddad, of the Workers’ Party. Not even after the first round of vote, when Brazilians granted Mr. Bolsonaro 46 percent of the votes, did the far-right politician address the media as regular candidates do. Instead, he chose to broadcast a live video on social media.
However, we could be missing out on exactly which social media platforms are...