I am personally pretty excited to see this diversification and fragmentation as it should help provide more niches for more people.
Substack is significantly more threatening and interesting to Twitter.
I love HN, but just because there wasn’t a lot of links to Twitter doesn’t mean it’s not the center of tech discussion
Probably not, in terms of how much 2040s tech will be based on this stuff. Language models are good for machine translation, and real-time image transcription, but everything else I've seen them do has better solutions (which have been around for decades in many cases, but don't have much funding).
Not sure what you’re referring to with “the destruction of libraries”, but all of the others happened more than ten years ago.