Show HN: App design that combines Reddit and Gmail for private treelike convos

This app has 6 major pages. Inbox, Post, Contacts, Blocks, Comments Made, Comments Saved, Comments Replies.

Inbox is like in gmail. It's a list of posts. There are tags for posts.

Post is like in reddit, (except you can mark comments as read to grey out their backgrounds). It's a hierarchy of comments organized by time, oldest at the top, newest at the bottom. You invite people into posts. Posts are not public.

Contacts & Blocks is like in gmail.

Comments Made & Comments Saved & Comments Replies is like in reddit.

I think this app could supplement email. It supercharges conversation quality for long, complicated discussions. I would like to make it but I don't want to deal with moderation & managing people. So I'm giving it up to the internet.