I've self-discovered a similar categorization for my imaginary social network that will dethrone El Zuck:

   Ultimate  - black/white - passwords/keys/finance/backups
   Private   - red         - hidden by default
   Protected - yellow      - default "logged in to computer"
   Public    - green       - shared w/ others (individuals)
   Broadcast - blue        - intentionally wide distribution

...the key insight being that as you go "deeper" you know "less" (if that makes sense). Take the pictures on my phone and the album names (eg: Fall Trip 2025).

If I post my headshot to hire-an-actor.com, that's "Blue/Broadcast". If I share a picture of my kid blowing out birthday candles, that's "Green/Public". From "Green" you might be able to see the LABELS of my "Yellow" stuff and request access to it, but there should be no indication that "Red" or "Black" even exists.

So basically you as a user always operate at "Yellow", and can push "up" to Green (aka: discord), or Blue (aka: tweeter), and can unlock "Red" or "Black" via Password or 2FA/Cert.

I wish there were a way to easily "vivify" this, but at least putting names to it exposes where/how we're currently lacking.

The biggest issue still remains that content is "slippery" ... if it's not 10000% protected and airgapped, there's a chance that it can "escape".