I'm skeptical as to how worthwhile your effort is as long as the outcome is just another alternative to FB. We've seen countless examples of how these alt-social nets failed. But I do see a lot of value in the tech you might be developing, and if in some way we could embed it into existing social nets, that would be amazing. Fingers crossed!
How easy would it be for Zuck to just update the TOS to say "encrypted content is against our TOS" and ban you?
Zuck can't add any encrypted content to your personal profile, which means he doesn't make any money off you. And Zuck can do pretty much whatever he wants in his castle, I'd say.
Content is mostly irrelevant, metadata is way more interesting. In other words they do not care what you say, but who you say it to, when you say it, from where, at what time, and so on.
