Okay.
Typically, as I said, in a regulatory regime, we figure that if someone discloses something then it's no longer private, whereas their notion of privacy is relational, and they want to negotiate it with different audiences.
If I post something on my Instagram account, and that account is for my friends, I don't want my mother looking at it. I want a mechanism that will say, “No, that's not my family account. That's my friend account.”
Typically, when they worry about privacy invasions, it's because the barriers between their different audiences have been removed. This is all taken out of the social-media world and made accessible to anyone outside of those audiences, and there are harms to them because of it.
Two 13-year-old kids in Toronto went on vacation. They got back. They were talking about their tans online. One said, “I'm darker than you,” and they were called into the principal's office for racist bullying, because they both happened to be African-Canadian kids.
They were thinking, “I'm talking to my friends, and we're having a chat, but because this information can then be captured, now I'm under surveillance by my school and I'm accountable to my school for everything I say.” It's the ability to keep those lines firmly in place that they care about.