I think you are missing the point. I am all for non-discrimination in the workplace, and freedom of speech but if you think your personal information is safe on Facebook then you are naive. It is stated and was even posted earlier, that in their terms of use anything posted on there is their's. Absent any specific laws Facebook could start selling your information tomorrow to potential employers, and they would be in the right to do it.
So I ask if you don't want people to know about it, or would be afraid of them finding out about it, why post this information on the Internet?