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What If: Signal Was Part of the Fediverse?
(signal.org)
A community to talk about the Fediverse and all it's related services using ActivityPub (Mastodon, Lemmy, KBin, etc).
If you wanted to get help with moderating your own community then head over to !moderators@lemmy.world!
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
Do you mean decentralized or federated? I don't really see how Signal would work with something like ActivityPub where so much information is meant for public viewing.
There's also Matrix if you're looking for just decentralized and federated.
I was thinking more in the finding contacts way since Signal only uses phone numbers
Try Matrix or XMPP.