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> lets us keep up with our family and friends, have productive discussions, share pictures, invite each other to parties

E-mail, with a better interface?

Seriously, this all can be done with E-mail and some locally stored data?

It is just a matter of implementing a UI (Web/Phone/Native whatever) and a messaging protocol, on top of existing Email infrastructure.

Delta Chat [1] is a good example of such an interface spanning all devices and platforms. Works suprisingly well!

Yes, found an old thread about this. It appears that the issues raised in that thread are not that hard to solve..