>This is where the whole "I looked up nike shoes on Amazon and now I'm getting nike shoe ads on Facebook" comes from. Without the IDFA, Facebook has no way of k

>This is where the whole "I looked up nike shoes on Amazon and now I'm getting nike shoe ads on Facebook" comes from. Without the IDFA, Facebook has no way of knowing what you looked up on Amazon, only what you look up on Facebook. Can this really be true? Wouldn't the conclusion be "Facebook can no longer rely on the IDFA for this information, but can probably gather it by a different ID shared between both Amazon and Facebook?"