Biased, but I don't think that's the worst thing.
But I'm sure Russia, China, North Korea, Iran, Saudi Arabia, Thailand, India, Turkey, Hungary, Venezuela, and a lot of quasi-religious or -authoritarian states would disagree.
Well given that we know Russia, China, and North Korea all have massive campaigns to misinform everyone on these platforms, I think I disagree with the premise. It's spread a sort of fun house mirror version of US values, and the consequences seem to be piling up. The recent elections in places like Argentina, Italy, and The Netherlands seem to show that far-right populism is becoming a theme. Anecdotally it's taking hold in Canada as well.
People are now worried about problems they have never encountered. The Republican debate yesterday spending a significant amount of time on who has the strictest bathroom laws comes to top of mind at how powerful and ridiculous these social media bubbles are.
Coupled with a vestigial strain of anything-goes-on-the-internet. (But not things that draw too much political flak)
The bubbles aren't the problem; it's engagement as a KPI + everyone being neurotic. Turns out, we all believe in at least one conspiracy, and presenting more content related to that is a reliable way (the most?) to drive engagement.
You can't have democratic news if most people are dumb or insane.