I think this refers to handling JSON ActivityStreams objects at the `/outbox` endpoint for a logged-in user, and then broadcasting those out appropriately. If s

I think this refers to handling JSON ActivityStreams objects at the `/outbox` endpoint for a logged-in user, and then broadcasting those out appropriately. If so, then yes that's the only API that's used. It also handles the uploadMedia endpoint and a few other details that are included in the spec. I have tried unsuccessfully so far to set up an OAuth provider server along with it, so that you could log in on your phone, etc.