It's quite probable that I'm not using Hubzilla to its full extent (or in the way in which it is intended to be used) but that could be because setting up an instance of it isn't as obvious as it could be. Or it is, in fact, "just me". Anyway, I'm going to leave it running for the moment whilst I investigate other options (the hardware it runs on is misbehaving - refusing to run IPv6) so it should be considered unstable anyway.
(repost because it won't default to public)