WhatsApp and Signal are considered "social media" technically, though plenty of people are still on FB telling the world about their trips and what they ate for breakfast.

I'm always surprised at how HN folks are either unable or unwilling to admit that the fediverse exists beyond Bluesky or Mastodon. I far prefer lemmy to reddit, and Friendica is essentially that the author is describing. This stuff exists already, and it's the perverse incentives of social media such as walled gardens and a critical mass of people that are what keep them alive.