Walt Mossberg via Twitter:
Why is Facebook so afraid of this simple opt-in panel Apple will soon build into its devices for every app (not just Facebook)? If tracking people all over the web is harmless or beneficial, shouldn’t they be able to convince people to allow it?
Very well said by Mr. Mossberg. The only reason why Facebook so afraid is because they are lying, the very same reason Google is still not pushing any updates to their iOS apps (except for YouTube - but very quietly).