Manyverse is the first SSB app that implements DHT invites: https://gitlab.com/staltz/ssb-dht-invite and the plan is to make it easier for anyone to invite anyone else, so that we rely less on a single "cluster". We want to get to the point where there are isolated islands of SSB networks.
But the point you seem to be talking about is also discovery, e.g. something like a "search" feature for friends. We don't have any idea in mind for that, and we also question whether that's necessary at all, specially as we seek to bring this app to countries with limited or no internet access.
> Manyverse is the first SSB app that implements DHT invites
Ok - this is cool! I can see how SSB/Patchwork/Manyverse could be used to replace old invite-only forums (which I've enjoyed with 'real life' friends in the past.)
So, yes, I do think discovery is a huge problem for SSB (and Dat, too) because one of the blissful (and terrible) things about the Web is that arbitrary people can find each other. This seems to be an even bigger problem now that certain networks are massive in scale - so the 'island' approach is one that excites me. Not sure about 'isolated', though. With Patchwork, I begin to wonder why I'm able to read things that I can't respond to - and then I realize that I probably don't want to anyway. I may just not understand the whole thing tho. :)