Heresy_generator

According to the documentation: Followers, yes; posts, no.

https://docs.joinmastodon.org/user/moving/#export
https://docs.joinmastodon.org/user/moving/#move

These are app permissions for the Threads app; so the app itself will collected all of the personal information from your phone that it possibly can and send it to Facebook regardless of how you limit the amount of data you choose to share with Instagram. The only way to get around this and still use the app would be to use a clean phone and never use it for anything that may generate or collect personal data.

Hopefully something like the “multireddit” system can be implemented so users can make custom groups of communities to view as a single feed.