While we're at it, I'll take the opportunity to mention that #ActivityPub, like any other federation protocol, is an excellent use case for #explicitMulticast (aka #Xcast aka explicit multi-unicast)
https://en.wikipedia.org/wiki/Xcast
It's a pity there hasn't been any major activity on it since 2007
<https://www.rfc-editor.org/rfc/rfc5058.html>, an inevitable side-effect of the push towards centralization that the Internet has suffered in the last 15 years. One of the many ways in which this killed innovation.

While we're at it, I'll take the opportunity to mention that #ActivityPub, like any other federation protocol, is an excellent use case for #explicitMulticast (aka #Xcast aka explicit multi-unicast)
https://en.wikipedia.org/wiki/Xcast
It's a pity nobody there hasn't been any major activity on it since 2007
<https://www.rfc-editor.org/rfc/rfc5058.html>, an inevitable side-effect of the push towards centralization that the Internet has suffered in the last 15 years.