Facebook is, primarily, an advertising business. It doesn’t just want you to grudgingly put up with its ads, and it certainly doesn’t want you to block them. No, it wants you to love its ads, to embrace its ads, and to beg to be targeted to selectively.
If you don’t want Apple collecting data on you and using it to target you with ads starting July 1st, you can opt out from “any device running iOS 4,” says AppleInsider. The opt-out is automatic when you hit up http://oo.apple.com from an iOS 4 device, and as far as I can tell you can’t undo it, so don’t click the link unless you really want to opt out. Also, it’s not working at the moment.