The latest cookie debacle has gone too far. If you use Facebook the only thing you can do to prevent the privacy invasion is to delete your cookies when you log out.
I stopped using Facebook about 6 months ago. I have also removed all like buttons from any website I own and I would delete my Facebook account if it were not for the dozens of apps and business pages I've created for clients that would stop working if I did. I manually deleted all my updates and photos and locked down my privacy settings so only family members and IRL friends can see my account.
The only thing I really miss about it is keeping up with family members and seeing everyone's pictures who I don't get to see very often.