On sites like Twitter or Mastodon, you mainly just have one feed based on the people or tags you follow

X has had lists, which allow multiple feeds for the same account, for a very long time now.

This doesn’t offer anything in terms of individual user personalization.

Reddit has the multireddit feature.

All of the above have to be set up manually, but Threads changes your feed in real time within the same session based on your interactions.