If you are talking about the message that is going around on facebook currently, nothing, it is useless and a load of rubbish!

http://mashable.com/2012/11/26/viral-privacy-notice-facebook/

Hi @bertievg, ignore the message. It’s been flagged as false information and even if you post it on your wall, Facebook is now a publicly traded company, so it won’t have any relevant effect.

@bertievg @scottlinklater @kimkline @otoabasiumonting Snopes also wrote a thing about it that I like too:  http://www.snopes.com/computer/facebook/privacy.asp

It seems like it’s really taken a new life lately!  There’s also a cartoon about it that is funny:  http://www.facebook.com/GrandmaMaryShow/posts/342951642468966