two-dimensional world of the internet has become more important than the three-dimensional world of human contact. People going door-to-door encounter the surprised blinking of American citizens who realize that they have to talk about politics with a flesh-and-blood human being rather than having their views affirmed by their Facebook feeds. Within the two-dimensional internet world, new collectivities have arisen, invisible by the light of day—tribes with distinct worldviews, beholden to manipulations. (And yes, there is a conspiracy that you can find online: It
