What, exactly, does a social network do? Is it a website that connects people with one another online, a digital gathering place where we can consume content posted by our friends? That’s certainly what it was in its heyday, in the two-thousands. Facebook was where you might find out that your friend was dating someone new, or that someone had thrown a party without inviting you. In the course of the past decade, though, social media has come to resemble something more like regular media. It’s w...