Looks like #ActivityStreams over #IPLD is very likely to be a thing some time this year!
Currently drafting up the grant milestones and figuring out budget.
Likely #rust or #golang to start along with some general #RDF goodies.
My hypothesis is that baking database indexes within the data itself will make it efficient to load people's posts over #p2p without needing to rely as much on indexing servers.