If an ActivityPub Actor is something that has an "inbox" or an "outbox" (i.e., it could have just one or both) then —

Perhaps we should also be talking about "sources" and "sinks", too. Where —

An ActivityPub Source is an Actor with just an "outbox" (and no "inbox").

And, an ActivityPub Sink is an Actor with just an "inbox" (and no "outbox").

#ActivityPub #ActivityStreams #FediDev