A global Facebook notification just popped up with the text: "We're improving ads based on apps and sites you use, and giving you control."
Here is the url it links to:
https://www.facebook.com/help/585318558251813?ref=notif¬if_t=oba
Here is the url it links to:
https://www.facebook.com/help/585318558251813?ref=notif¬if_t=oba