Ya I keep forgetting it’s similar to email. But at the same time for every reply, is it not similar to doing a reply-all, with each federated instance being in the recipients list? And don’t forget what happens when everyone starts doing a reply-all when on an email with a large distribution list… The email server ends up taking hours or even days to processes that queue. Hopefully I’m over thinking it, but I’ll learn more over the next few weeks as I study ActivityPub more and more.