In case you were not aware, when you visit a website, use your cell phone, participate in company loyalty programs, using twitter, Facebook or any kind of social media. Hey you're willingly compromising your privacy. Though personally I think privacy isn't compromised as such, it's more of a linear scale in that we trade off acceptable amounts of our privacy for convenience.
Privacy is something which has been described as a commodity that is hard to hold onto in this day and age.
Frank. M . Ahearn teaches how to reclaim privacy in this digitally enabled age. By following his (somewhat over-zealous) advice you'll be able to fall off the grid.
He authored a book with Eileen C. Horan entitled "How to disappear: erase your digital footprint, leave false trails, and vanish without a trace" - Quite a catchy title and very apt for the very privacy concerned individual.
In my experience those who are really privacy concerned have nothing that any marketer would value as they are in fact just an outlier and therefore help very little with statistics. Modern society seems to be geared up to deal with and accept casual tradeoffs of privacy for ease - and I personally am subscribed to this. You're reading my blog and know I have a twitter, I'm willingly giving a plethora of information about myself out into the ether that is the Digital Age, but hey, who really cares about what Mark is doing?
Take a look at the book, it makes for an interesting read.