There was a guy on another forum the other day who was talking about how he wouldn't share any personal location details with us (we were discussing unemployment in our areas). He was making a big deal out of it, so I Googled his screen name, found another forum he used with the same screen name, discovered his full real name, plugged it into an online whitepages, and had his home address, phone number, and the name of his employer. This all took about 5 minutes of looking. I didn't tell him about this; didn't wanna burst his bubble.
There is a lot of information out there unless you have taken extreme measures to contain it. If you don't want employers to find out about your indiscretions, keep them off the 'net. Or better yet, don't be indiscreet.