https://fedifinder.glitch.me/ finds contacts on #bluesky as well. I am still waiting for other #ATProto instances to materialize. While I like certain aspects of the protocol, it doesn't reflect how I want communities to function (see https://social.luca.run/@luca/110282771133307616).

From my 2042 followings, #fedifinder found 488 fediverse handles and 104 bluesky handles (at least 9 false positives).