Heads up to anyone using facebook or insta: you'll receive a notification about your data being used to train AIs. The opt out process is deliberately convoluted and you have to fill out a form to object. This is what I wrote in mine, and the objection was immediately registered as successful, so feel free to copy.

Masto reply bores, this is not a post on which to fart out your opinions about Meta or AI or whatever. So don't. I'm sharing helpful info for people who need it, not for you.

@stavvers Thanks, I've adapted and expanded on this. To anyone in the notes looking for where to do this, the link is here: https://www.facebook.com/help/contact/367438723733209
@stavvers I've double-checked and it's the same link for Instagram, just FYI. I stopped using Instagram ages ago because I couldn't find any way to deny permission for this, but the tip to dig down through the privacy policy is what I needed.