Is there a main site/directory that lists all Public PeerBoards like Reddit?

The PeerBoard Community Is there a main site/directory that lists all Public PeerBoards like Reddit?

I saw how you want to be more like Reddit in being able to set up all the communities. Since many boards do not have a custom domain, is there a place to search all the created public communities so people can join on other public boards? Is there a setting (or does a custom domain already do this) that makes your board "private" and not show up in that list/directory?

Thanks!