It's still slippery enough to trip us up. Consider the 4th Amendment, which protects against unreasonable searches and seizures. When is a search or seizure unreasonable? That's largely determined by what people reasonably expect to be private. Widespread public sharing of what used to be considered private could move the boundary, allowing searches or seizures without a warrant for things that formerly required warrants.
The was an interesting article in the Stanford Law Review a few years ago that looked at this kind of thing [1].
[1] https://www.stanfordlawreview.org/online/privacy-paradox-the...