[oasisbob]

Likewise. If it's a well-thought out encrypted blob store, fine...

But given that Facebook, Instagram, and WhatsApp would seem to have vastly different caching and security requirements - its hard to believe.

Is any of this architecture publicly documented?

[thrusong]

I think Zuck himself said recently they're moving to encrypt everything and merge infrastructures for single login across properties (which a lot of us think is them sneakily trying to make their web properties a lot harder to split up in an anti-trust case).