To see what new communities are being created in the lemmyverse/threadiverse you can follow:
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Just so you know, that community that your promoting is the community you posted this post in
Hrm… seems this was federated from a Mastodon user. I haven’t tried posting to a lemmy instance from mastodon but it looks like the
@[community name]
syntax must generate a post on the corresponding Lemmy instance in that community