Different take, from a piece for The American Conservative, by Micah Meadowcroft:

“Social media do not contribute to political extremism by letting us sort into ideological silos; instead, they constantly expose us to people with beliefs and ways of life that appear to us as a threat,” he argues. “We have not been siloed by 24 hour news and digital infotainment, but rather exposed incessantly to the reality of different types of people and alternative ways of living. Our communities and the social order we take for granted become at risk as, thanks to technology, we find ourselves unable to simply live apart from the other. For the other is now here, in our home, in our face, on our screen, all the time.”