Where are you seeing that sentence that you quoted? I'm curious to take a look. I don't see it in the verge article that you linked to. Apologies if I'm missing something.
Sorry, that was unclear. That sentence is from the WebKit/Safari policy which I linked earlier in the thread. (The Verge article is a synthesis of the stated policy and the fact that the WWDC presentation clearly had a screenshot of blocking Facebook cookies.)
All good, thanks for clarifying! I'll take a look tonight.