Briefly looked at their documents here https://nostr.com/ you know how I feel about videos

I'd have to spend more time looking at their docs to understand completely how this is supposed to work....but I'll try to explain the high-level overview.

Its P2P...sort of. A 'user' is a just a public/private asymmetric key pair rather than the 'peer'. You use the keypair to access a client app, of which apparently there are many different versions created by different people (i.e. different apps). The clients connect to 'relays' which can be run by anyone, and act as the physical location where the data is published to. The client interacts with the relays and fetches the shit you want

I'd think of this more as an infrastructure than a social media 'app', I'd have to spend more time looking at this to tell you if I think this can solve all the problems they think it can, or whether this relationship between user/client/relay would result in a disjointed clusterfuck like Mastodon and the decentralverse does where the nodes all cross-block each other.