How so? When I say "private" information is increasingly becoming "public", you assume I'm treating privacy as a binary thing?
Whether one declares information as classified or public isn't an inherit property of the information itself, and as everyone has increasingly similar access (relative asymmetry approaches 0 on a scale from 0 to 100) to information (which seems to be the direction of our collective behaviors, especially if we compare to prior times in human history), trying to classify any information in either state or on a spectrum, seems increasingly like an exercise in futility/irrelevance (to me) in the face of what we are seeing take place and the capabilities on the horizon.
The "private" vs. "public" divide is less binary than your suggesting.
Individuals, corporations, low level government workers, and the government as a collective all have differing access to different types of information. Also, it's not just pieces of information but also the ability to deal with that that's restricted. For example you might look at a few tweets, but twitter rate limits you without paying them a lot of money.
Edit: (removed redundant crap).
Sure, Russia got copy's of the design for both the first Atomic and Hydrogen bombs. So, every country with nuclear weapons can trace their designs back to those same researchers. Yet, even after 10's of thousands of people have seen them (or a derivative design) and 70 years good luck finding detailed documentation on Google.
Sure, but you would think the way you hear the media going on and on about people getting access into "types" of information they shouldn't have access to (banks pretty much consider electronic hacks apart of the cost of doing business these days), using the same tools as the people who construct such systems, its not hard to think otherwise compared to say hundreds of years ago. I mean, anyone could easily look up as list of free proxies and crawl twitter to get around the ip rate limits (or any site for that matter, people do this all the time), increasingly more than ever, people have the ability to access such information (and vasts amounts of it) more than before. Whether they feel compelled to is a different story. Same goes for the fission and fusion weapons: the physics behind it is pretty much available in every university in the world (and their online lecture notes), I just think not many people just want to build such things. And all this is pretty much within a century. Took much longer if one looks back throughout human history for knowledge of information to even propagate throughout different cultures.
Beyond that, I don't really know what to say beyond that things change. A lot of the social constructs that we are born into may be totally irrelevant in our lifetime regardless of our opinions about them, some people can adapt to such, and some people will go to their grave with cognitive dissonance of such change clinging to their memories of a world that was but will never be again.
Classified information for example has never been completly private, but the vast majority if it is reasonably well protected.