The move towards complete availability of all digital information seems to be a force of history. Privacy advocates are beginning to sound like copyright advocates, demanding that the universe continue providing for them in the manner to which they have grown accustomed.
Like copyright/IP, privacy is more about use getting used to (and in some cases legislating) how things happen to be, not predesigned or derived from first principle rules or morality. If 99% of your existence occurs within a community of 150 people, very little is private. When you live in a 20th center city, you get a lot of anonymity. You can keep private life (even several of these) separate from your professional life. etc. Those were just inevitable consequences of how those societies were structured.
The internet was at first an anonymous place. Pre-2000 most people seemed to share the feeling that if their real name found its way to the world wide web, serial killers would come. Then 2000-2005 people started keeping online diaries, online photo libraries, online lots of personal information. Facebook catalyzed this process with a semi private system of friends that matched what people were used to in their normal lives.
The force of history that is 'all your data available to everyone everywhere' feels unstoppable. Data is data. It doesn't care if it's an email, SMS, baby photo or GPS log. It doesn't get deleted.
Maybe "Information wants to be free" was an understatement.
I feel very awkward trying to describe this, a clear sign that I don't understand it. I wish pg Joel Spolsky, Chris Anderson (or ideally, Douglas Adams - I really wish we still had him) or someone else who's good at this sort of abstract thing would write a good piece on it.