I think that rather than creating the echo chamber, it has just made them more visible and more niche. In the old days, most of the country was part of the echo

I think that rather than creating the echo chamber, it has just made them more visible and more niche. In the old days, most of the country was part of the echo chamber that Walter Cronkite, David Brinkley, et. al. led. Since we were (mostly) all in it, it didn't seem like a bubble, just reality. Now internet tech is letting us inflate our own bespoke bubbles, and easily peer into the the other bubbles. Yes this causes conflict. But in the end multiple echo chambers are an improvement over one big one, plus a few small alternatives that only weirdos like me were in.