My opinion is that if you post personally identifiable information to a public website, and expect that information to be kept from all the world's eyeballs, you're being incredibly foolish.
The problem is you can't control what other people post.
I create an account with just my name and use it to keep in touch with my friends and family.
It doesn't take long before someone posts a photo from my birthday party and annotates my name. A quick grab of my friends list reveals some workmates, one of whom has a map of the office.
so without me doing anything but putting up my name and a list of friends, anyone can now work out where I live, work, when my birthday is, and what I look like.
I deleted my FB profile a while back and am glad I did.
- Muggins