#Smithereen update, now that the heat has subsided and I'm capable of thinking again.

User actors now have `friends` and `groups` collections. These collections contain links to someone's friends and groups for easy synchronization in the future. Also, actors now send their followers Add and Remove activities for these collections when they add/remove friends and join/leave groups. This lays the foundation for an upcoming feature ;)

#activitypub @activitypub #mastodev