ftlio

When you add a friend just append new pubkey encrypted symmetric key for each asset. Friend removal is even more expensive and requires the client side to reencrypt everything :(

I'm sure there are better cryptographic constructs out there with multi key encryption that can alleviate some of the insertion and removal costs.

You could do it with decent trade-offs for the content provider as well. You could obfuscate everyone else's face but yours and allow them to get access to that image and then just encrypt the map for your friends. Of course then it's all about just creating enough mock accounts to recover the full images throughout the graph. Or just take custody of a user's keys in exchange for features.

Still though, it's marginally more expensive to build a mass surveillance app!

^ Following along with this helped me a lot. Bitcoin is a rather large onion, but, as others are saying, implementing parts of it is the only way to go.

https://mises.org/sites/default/files/15_3_3.pdf

and Debt: The First 5000 Years by David Graeber

Conceiving of the government and private enterprise as separate entities really doesn't make sense. They both exist as a matter of energy and resource economy (in the sense of managing resources). They're adversarial and mutually beneficial, as is pretty much anything in any ecology.

They don't want to make Half-Life 3, the expansion to Half-Life 2. They want to make something new. They created something new with Portal, which required them to hone their ability to introduce players to an entirely new game mechanic, but now they have to wait for VR to put it all together.

And they're not really coasting. They're at the forefront of broadcast gaming, competitive gaming, whatever you want to call it. I've watched Riot grow, and Blizzard falter in that industry, but I'm damn near positive that Valve has the better framework for the long-term.

Edit: I also think that Valve's primary product is "not having to deal with industry standard financing and deadline problems so we can make games that are actually good without burning out like everyone else does."