Earlier quoted context omitted.
>These are not defined in a strict mathematical sense, and they don't actually exist, but the phenomenon certainly does. That's my point, I'm disputing the central assertion that these phenomenon actually model reality. >For example, hordes of Twitter users have self-selected who they follow until they're exposed to opinions that agree with their own. This is and has been happening out there, in the real world, to re…
> But it hasn't been shown that they always do it, or do it for the same reason in every case. We don't need them to always do it, or for any reason. The fact is that it does happen, as evidenced by, e.g., https://www.cnet.com/news/twitter-echo-chambers-are-very-rea...
"However, as we focused on politically-savvy users on Twitter, the reader should not infer that our observations generalize immediately to other settings, or that echo chamber effects are as pronounced for the general public."
Exactly what I said - " But it hasn't been shown that they always do it, or do it for the same reason in every case."
I don't know why you are pointing to a study that agrees with me.