[codezero]

Retargeting doesn't release the information to you. They are selling access to their network under specific conditions. Retargeting just lets me say, "make sure X sees my ad", it doesn't let me say "I know of X person, send me all their information so I can do what I want with it."

There's a pretty big difference. Facebook and Google would not be in business if they let third parties aggregate their detailed personal records.