As you point out, we make efforts to update our data use policy on a regular basis. We consider it to be a guide to privacy on Facebook, so we want to provide information to people that's current and that reflects the way our site currently works.
Many of the changes that we do make to the data use policy are in response to feedback we've received from policy-makers. As an example, the most recent round of changes...right now, the one that you referred to, that's dated November, has not been adopted. It's a proposal that we've made to our users and we're seeking comment on it. But the one that's currently effective actually reflected a number of specific pieces of feedback from the Irish Data Protection Commissioner's office. There were areas where they thought they were comfortable with our practices but wanted us to be very explicit in our data use policy about how those worked, so we updated the policy specifically in response to that feedback.