[andrewfong]

Born in the 1980s, not sure if that makes me a millenial.

The sentiment is incomplete. Privacy exists, but private from whom? The younger generations still have a reasonable expectation of privacy against their parents. But probably much less of one against Facebook, Google, or the government.

Public by default also doesn't imply a total lack of privacy. Younger people overshare all the time on social networks, but there's still an (unreasonable) expectation that these things are quasi-private. Think of it as talking loudly in a mall with your friends. Yes, anyone can overhear. But no one actually expects anyone to care or pay attention to your conversation.

EDIT: Should also point out that millenials and other generations are not homogeneous groups. I imagine that white upper middle-class Christians would likely have different expectations of privacy in America than someone who is black, poor, and Muslim.