How do they not see?
How does social media drive political polarization? Justin Rosenstein explains in The Social Dilemma:
You look over at the other side, and you start to think, “How can those people be so stupid? Look at all of this information that I'm constantly seeing. How are they not seeing that same information?” And the answer is, they're not seeing that same information.
This is by no means the only way social media drives political polarization. It turns out, showing users gradually more extreme content is also a great way to keep them addicted. More addiction means more screen time, more ad impressions, and ultimately more money for these companies. Still, it's a great place to start when describing the problem. The other side is not seeing what you see. In fact, they're getting a constant stream of information about how wrong you are, and you'll hardly ever see a drop of it yourself.