>And if Facebook tracking is so great for the users, then clearly every user will opt in. IME for most users the default action for any popup falls into two c

>And if Facebook tracking is so great for the users, then clearly every user will opt in. IME for most users the default action for any popup falls into two categories - (a) Quickly close it without reading, (b) Accept it blindly without reading. The ratio changes, but I think its about even.