To my understanding - in BlueSky (and Mastodon) this is possible (you can pick the reverse chronological feed) but in Twitter or Threads this is not possible.
Mastodon doesn't have a non-chronological feed to begin with.
Threads does have a chronological feed but it's very well hidden. In the mobile app, you have to tap the logo to reveal the selector. On desktop you click the arrow button next to "for you".
