Meta/Facebook/Threads/Instagram is now using your content for generative AI. There is a form to opt out, although I don't know if it'll make a difference, but here it is: https://www.facebook.com/help/contact/1266025207620918
@grantonthenet seems it's only to avoid third parties from getting your private data. More an "objection" than an "opt out", reason why I don't trust it'll make a difference, but at least there is some kind of form.