I think that an important thing to understand is that social media generally doesn't project a single bias. It is more dangerous: it creates bubbles that encompass groups of people and then mine their minds for attention. This results in polarization, increased rage, and fake outrage, and the like.

So it isn't really helpful to complain that Twitter is leftwing or rightwing etc.; it amplifies for you whatever you already believe. Even though we can generally accept that people's minds don't really change on big issues (whether online or in person), one big problem with social media is that it disincentives listening to each other. "Distincentivze" is perhaps euphimistic - it puts up hard to penetrate walls between us. We don't listen to each other, even if the other person has a worldview or conviction that we detest.