The caudillos were political, military and ideological leaders that emerged during the 19th and 20th centuries in various countries of Southern America. These were not popular leaders, but led the popular sectors leading a coalition of elite forces.

I still remember the Tuesday I accidentally swiped right on my high-school lab partner—on Facebook, not Tinder. My phone buzzed, and suddenly “Chemistry 2.0” was more than a class; it was a potential date. Here’s the thing: none of it would’ve happened if I hadn’t first unlocked Facebook Dating,...