2·1 year ago- no, each server (kbin.social, fedia.io, lemmy.world, etc.) can have their own communities, since there is no centralized server that manages community names it would be impossible to track which servers already have a community with the same name
- yes, that’s the beauty of the fediverse! this post explains how you can do that. you can also view and interact with posts from other federated social media sites such as Mastodon if you are interested in that sort of thing