If you want better/more cost effective campaigns, do what was done in the past: just fucking ask! The nature of marketing hasn't changed at all over the years.

If you want better/more cost effective campaigns, do what was done in the past: just fucking ask! The nature of marketing hasn't changed at all over the years. Show an impression, ask what the user was influenced by. Surreptitiously stealing data off of someone's computer as a means of answering the question is flat out the wrong way to do it.