I mostly follow L7+ SWEs, creators of popular tech like dynamoDB, and professors in AI/systems/DB/PL. The ones who tried to move to sites like mastodon eventually came back, or are now using twitter much more than these alternatives. There's been more top SWEs and professors especially in AI and systems sharing content there.

Noticed as well that twitter is also more optimistic about tech than HN, especially with subcultures like e/acc, learning/building in public, etc.