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Bluesky opens to public registration
(bsky.social)
A community to talk about the Fediverse and all it's related services using ActivityPub (Mastodon, Lemmy, KBin, etc).
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Learn more at these websites: Join The Fediverse Wiki, Fediverse.info, Wikipedia Page, The Federation Info (Stats), FediDB (Stats), Sub Rehab (Reddit Migration), Search Lemmy
I don't follow it very closely, but as far as I know, they are the only one implementing the open protocol they designed (which doesn't interoperate with ActivityPub). However, there seems to be some efforts for creating a bridge: https://www.docs.bsky.app/blog/feature-bridgyfed
As you said, there are some recognizable faces and that may impact the adoption. But not being compatible with ActivityPub is a real bummer.
I was going to say, if it federates at all then a bridge should be possible