I don't care about "tech personalities", but most of the IT people whose ideas I'm interested in either have RSS feeds or Mastodon accounts, or both.
The only reason I'm even still on Twitter is so bots don't take my username (not that it matters, it isn't that valuable, but I've had it since 2009 and they can take it from my cold dead hands) and following a couple of Japanese accounts (mostly Aya Nishitani, creator of the Shin Megami Tensei series.)
I dropped all of my follows and comments and now I get the raw unfiltered feed and JFC is it a cesspool.
I'm only really active on Mastodon now, however.
They recently welcomed and verified ICE.
Yes, that ICE.
While the Fediverse is likely to have even fewer content creators, it isn’t a captured marketplace like Twitter or BlueSky is. There is already one programming-focused instance, https://www.programming.dev/
gamemaking.social
indiepocalypse.social
mastodon.gamedev.place
peoplemaking.games
But following hashtags like #gamedev or #programming is more useful than following instances, generally.