Why would anyone agree to this? I don’t see a benefit to letting Facebook or any company track me across the internet. When did we ever decide this was what consumers wanted? Every time this topic comes up I check Facebooks stock price and realize how detached people are from facebooks revenue driven by the advertisement market.
(There's a term "dancing bunny attack" for putting interesting content behind a confirmation dialog you want people to click. Facebook kind of does that implicitly. All they have to do is hide appealing content behind this option.)