[supertestnet]

Peer discovery and peer suggestions are not implemented yet. People have been posting their public keys on twitter etc. There is a proposal for encoding a set of followers/followed in a message which your followers' clients can then use to display info about that on your profile. That should help with peer discovery once someone codes it up. You can also find threads that people are widely commenting on (e.g. someone might post a nostr thread on twitter) and follow people who post in those threads.

[Ambolia]

It's not so much peer discovery, rather the nice thing about Twitter compared with a newsletter or a blog is that you get a post and different people responding and interacting with it.

I guess some level of interaction will be needed to replicate the things people look for in Twitter. I guess a very basic functionality that that would cover this would be posting in your timeline "responses" to other posts by including the key of the other author and the cryptographic signature of the post. From that a client would be able to obtain the "parent" post and build a thread.