True, but at the same time deleting a post only matters because new people can see it that may not have initially. With this, only people who the message was se

True, but at the same time deleting a post only matters because new people can see it that may not have initially. With this, only people who the message was sent to would see it anyway. If as part of the on boarding process you could provide instructions to move those messages out of the main view and into a folder so they didn't clutter up the rest of the email too. It probably makes more sense as an open source project. There's not much of a profit model for decentralized social networking where you can't inject ads that people didn't want to see.