This will be super-cool if it works.
(Also: using brid.gy to back-propagate comments.)
@futurebird lots of good details in the replies that you got, but maybe examples will help?
Excuse the broken images, that’s my fault
On my site I have https://fed.brid.gy/ set up. So When I post on my site and put the link on Twitter/Mastodon, it gets comments/reactions there and adds them to my site. I can then reply to the comment and have it post to social for me.
This post has replies from micro.blog: https://davidwolfpaw.com/wordcamp-boston-recap/
This post has replies from Twitter: https://davidwolfpaw.com/flashback-conference-recap/