I'm thinking about developing a project to map the "linked" instances of the Fediverse, starting with which ones federate with Mostr bridge... It's frustrating replying to these posts and not knowing whether anyone actually sees your replies.
Anyway, apparently there is some API of "peers" that is published by each Mastodon instance, I guess I'd have to search them all to figure out which ones would talk to mostr.pub ... ?