Basically, if you have a cryptographic write only log of social activity, and can exchange that with others, you can create social activity/interactions that are only readable by your social graph (as it should be), and not by third parties/providers.
It's a really, really neat concept (in the vein of the awesome stuff happening with distributed cryptographic consensus in general), and simply needs easier entry points for mass adoption.
Basically, if you have a cryptographic write only log of social activity, and can exchange that with others, you can create social activity/interactions that are only readable by your social graph (as it should be), and not by third parties/providers.
It's a really, really neat concept (in the vein of the awesome stuff happening with distributed cryptographic consensus in general), and simply needs easier entry points for mass adoption.