As I have referenced in other posts, my day job is as an information security and privacy professional. Some of you may be asking, "What exactly does a privacy professional do?"
The answer is, we keep tabs on what the government and businesses are doing when they collect our personal information: how long they keep it, how they protect it, and (perhaps most importantly) with whom they share it. If you want a frightening illustration, here is a link to an article that appeared in the New York Times a few weeks back which goes into great detail about what author Charles Duhigg found out about Target's targeted (pun intended) marketing efforts. Even though understanding the marketing techniques he writes about are a component of my job, I found it to be a real eye-opener.
This article draws from Duhigg's upcoming book, The Power Of Habit: Why We Do What We Do In Life And Business.
If you're concerned, or even curious, about your personal info, you'll want to read at least the article, if not the book.