I saw a recent study that said frequent posters on twitter are likely to be on the extreme left or the extreme right.

I don't have any data on how this has changed over time, but my guess is that social media polarization has increased over time.

People who are in the middle, or have some beliefs on each side, or are willing to seriously consider points from both the left and the right just don't post much anymore. On the rare occasion that they do, they get downvoted to the point that they are invisible.

So yes, when you look at social media you see the extreme left and the extreme right lobbing insults at each other. Or you might catch a glimpse of the extremists working to silence the moderates, if you dig deep enough.

I don't think it used to be as bad as it is now.

The polarization is continuing to get worse and worse.

How do we stop it? I wish I knew.