One of the ways this ends is that people of different political persuasions set up their own (social) media platforms. This has happened before with print media, where the US used to have and most of Europe still does have media with expressly partisan positioning.

This has happened to some extent with Voat, and if there's really a demand for like minded people to communicate without having their discourse contaminated by opposing partisans then I'm sure the same could happen here.