@jenn As for #Facebook, the only thing better than deleting it is not signing up in the first place. There is nothing you can do to communicate to a Facebook-only user without compromising your own security and giving FB more power. If you can manage to get their email address, you can send them encrypted email by shared key. But then you have to work out a clever way to get the key to them. IIRC #protonmail and #tutanota have that capability. It's a hassle for the recipient, but rightly so