[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.