John Gruber comments on Facebook’s culpability in the growing political polarization:

Perhaps Facebook et al have less exacerbated kookery — particularly but not exclusively on the right wing — than revealed what has always been there, under the surface of American culture and politics. Perhaps the undeniable increase in extreme political partisanship is not the problem, but in fact the solution — the natural result of our collective reckoning with the lid having been lifted, revealing deep and pervasive social rot that we’ve long pretended was neither deep nor pervasive.