I believe FOAF has been a term in semantic web for a long time. Not having seen much uptake, it (the idea, not the defined ontology) can get a new life on Nostr.

And I wouldn't be surprised if existing social Nostr apps don't already work using graphs where an unknown friend of a friend is more likely to get a boost than a bot.

I'm not up2date on Nostr tech, but if it's not already been worked on, it will happen, I'm sure.