It's absolutely true what @daj says. His useful message included @bookstodon@a.gup.pe but it would not have been seen as he's not using a mastodon server and the gup.pe groups generally don't work beyond mastodon.
Using #FediGroups is more inclusive across the entire fediverse family.
Referring to: https://gofer.social/@daj/statuses/01JGCM80X8SHJHJNGSZAXHZGPW
Cc @bookstodon
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