In 4 however the author claims that previously we could say certain things that we can't say now, due to social pressure.

And I certainly can confirm it. At the same time extreme world views are more pronounced (echo chambers in social media) and people lose their jobs because they said something "wrong". What causes these seemingly opposite changes to occur at once? Did we just lose ability to discuss things in civilized manner due to lack of...well, discussions in the isolated internet groups? Are we so far from each other that we replaced normal human talks with diplomatic relations, as we represent different echo chambers, despite living and working together? Maybe that previous self-moderation gave some room for discussion because we could assume our interlocutor at least had common problems and interests with us?

Thanks for sharing this book. I'm only at chapter (or "piece" as the author calls it) and already have something to think about.