That's a pretty twitter-centric view of things
See this https://www.statista.com/statistics/272014/global-social-net...
I have no clue where the hell people get this "public square" analogy from because the numbers don't back it
Twitter seems to me more like an open free-for-all where any text can get amplified and publicly interacted with and very little is behind private accounts/groups/silos and anyone can easily contribute.