[magice]

I see that you don't understand the problems raised.

About accountability: if YOU are compromised, your friends' data are compromised, and vice versa. Are you saying that the median security skill of your friends are higher than Facebook? Because any of them can leak your data unintentionally.

About encryption: it's freaking useless in this case. Remember, some people fall for Nigeria prince scam. And what happen when their keys are compromised? See above.

That's the crux of the argument: you can't guarantee that your precious friends and family can safeguard their keys (in fact, I doubt my personal security practice is remotely as good as FB or Google or Amazon or MS or Apple). In that case, by the virtual of distribution, your data is copied everywhere, waiting for any key to compromise.

[strypey]

It boggles the mind that people still have the blissful trust in the security chops of giant corporations. I could give you a long list of well-funded corporations whose servers have been cracked in the last few years (remember Ashley Madison?!?), but I really only need to mention one; GitHub ...