We have this idea today that everyone online is getting trapped in echo chambers, but that’s been the case for most of human history.
When people mostly communicated with those in their own town that is a bubble. Radio and TV is more of a bubble because there is limited "bandwith" in the scheduling so it has to be editorialised (not necessarily a bad thing).
Social media companies do choose what you see via algorithms, but I'm not convinced they benefit from only showing you content you "agree" with, it feels like being shown a certain amount of content outside your "bubble" would increase screen time. There are also the comment sections that often have contradictory views.
Even social media (setting aside the rest of the internet for the moment) will expose you to more viewpoints than the the social circle in your home town, or a TV/Radio schedule. I'm not saying it is a healthy way to be exposed to other viewpoints, but I don't think the problem with social media is that is creates a bubble.
(now to wiping the tears of laughter from my face...)