Earlier quoted context omitted.
I would love if someone made a Chrome extension that encrypted all the posts and messages you put on Facebook. That is, any post you made would be made as a ciphertext, the extension would swap keys with all your friends in the background, and would decrypt their posts when displaying them to you. Sure Marky Mark still sees when you post, who you send messages to, etc. but it's a much better situation than what's goi…
If you have out-of-band connections with all your friends and you have friends who are willing to jump through weird, nerdy, technical hoops, what do you need Facebook for?
There would be no out-of-band connections. The extension uses Diffie Hellman or something to swap keys with your friends over Facebook (or maybe through a server run by the extension provider.)