In my opinion, “instant, public, global messaging and conversation” should, in fact, be global. Distributed between independent organizations and actors who can self-govern. A public utility, without incentives to exploit the conversations for profit. A public utility, to outsurvive all the burn-rate-limited throwaway social networks. This is what motivated me to create Mastodon.
Besides, Twitter is still approaching the issue from the wrong end. It’s fashionable to use machine learning for everything in Sillicon Valley, and so Twitter is going to be doing sentiment analysis and whatnot when in reality… You just need human moderators. Someone users can talk to, who can understand context. Unscalable for Twitter, where millions of people are huddled together under one rule, but natural for Mastodon, where servers are small and have their own admins.