Ahem, While You All Were Arguing I Noticed...
Every one of you is leaving a long, intertwined trail across the Internet, and if you think no-one else is watching it you're dreaming. It's too late. Unless you can somehow magically undo the last ten or fifteen years of life on the 'net (Usenet anyone?) you've already missed the privacy boat.
Yes, there are things that you can do to maintain some control of how much about you is known to the Inter-Corps, but really as long as you use Google, Facebook. Twitter, or even El Reg, you've already agreed to having really tidy profiles built up that tell more about you than you likely know yourself.
None of this is going to change. Corporations (who fund the politicians that govern us) like this. Governments sure as hell LOVE having that kind of data. And honestly, in terms of day to day ease of use we like it too. We may grumble and complain about privacy, but having our data stored at Amazon or in our browsers is sure handy.
And yes, if the pool of data about you is large enough and deep enough, there's no way government will keep their fingers out of it. We've reached the point where any intelligent person assumed that they're being watched, and behaves accordingly.
The good news, I guess, is that sooner or later someone will develop the privacy/crypto/anon equivalent to Bittorrent, and the more thoughtful among us will be able to hide muchof what we do. Tor is a start sure, but just the beginning I hope.