Shucks. Deputize those folks, and send them after bin Laden. They probably could do better than INS for finding illegal aliens...Imagine their power if they cross-linked to the rental-video chains!
Hey, just type your phone number into Google: Zap! There's your name, address, and a choice of two maps of your residence location. (They're three miles off, on my location.

) Type your name in. Surprised? Type your Internet "handle" in: How many websites do you visit and post?
My wife, at her business, used to get mailing-list offers--categorized by zip code or by occupation--and other formats. That's from before the Internet. People have been collecting data for resale purposes for as long as information has been available. The difference is of degree, not of kind.
Nowadays, I guess, personal security against white-collar Bad Guys--whether private or public sectors--lies in having a zipcode in a lower economic area, for one thing. If folks think you're poor, you're of no interest. If you're making good money, have a working checking account with only monthly needs in it--the rest in some different bank or different type of account. Pay cash for as much as you can. And, better to write a check than to use a credit card.
But as long as people can make money snooping, they're gonna snoop.
'Rat