I still want to see a social platform based on email. :-)
As long as you aren't looking for a platform with promoted follows vs just friends and family, it seems like a more ideal way to do so without having to worry about anyone else "owning" your network. Add encryption, etc as well if desired.
Email seemed to be the safest and most widely available means of async data exchange, with IMAP making it possible to sync between mobile and desktop easily enough.