jdt@enigmatick.social could it be a mistake in the reply? For example, if the reply had all of the mentions removed I would think Mastodon would send out an object with empty to and cc.

dfyx@social.helios42.de because followers and outbox collections can be faked.

jsit@social.coop Ghost? NodeBB? Just to name a couple

לאצי the usernames work fine locally (that is, on the site itself). It's when interoperating with other sites not running NodeBB where there are issues, it seems

trwnh@mastodon.social before, I was not sending Accept at all, now I am sending application/jrd+json.

@pfefferle Wow, danke für das super Video! Für mich ist das Fediverse noch ganz neu, hab jetzt mein Blog föderiert und mir einen Account bei Mastodon erstellt. Fühle mich noch etwas verloren, aber bin überzeugt auf dem richtigen Weg zu sein

NodeBB is gearing up for a major release this month that brings full two way federation and content discoverability to forums as well! We've been working on it all last year! @activitypub

Uups, next try https://nrw.social/deck/@FrankM/113606591981853331