I see this as a problem that is not caused by Facebook or a few other big players. And this problem would be the same with or without Trump. It is just too comfortable and easy to get into the echo chamber. It is almost like people enjoy being angry, because it makes them feel smarter. (I'll be honest, I looked at myself and that is what I saw.)
We need a popular news/information source that both sides can believe in. Maybe there could be some sort of peer review by respected liberals and conservatives?
This can gradually erode the perception of neutrality and foster a slow progression by the neutral source "away from" the group that is claimed them to not be neutral.
Is there any way to fix this other than settling at a new, far removed equilibrium point? I think there is, or at least hope there is.