I really do like SSB in concept, but I am kinda sad that it seems to fit mainly for social networks. I would like to see something more discussion/topic focused than user centric, but of course with the whole peer to peer and offline aspects.
The SSB protocol and feed database are both very flexible and can be used in the way you want if someone builds the app for it.
hmm.. at it's core it's just a database (that syncs across the friend graph), you might find cel's work on git-ssb and ssb-npm-registry interesting. you could just as well make something like discourse ontop of it.
we are currently discussing something more _groupware_ like to remove the dependency on github for issue tracking.