I think avoiding creepiness requires using intuition from human interaction. In particular, it's creepy if someone knows something about you and you don't know

I think avoiding creepiness requires using intuition from human interaction. In particular, it's creepy if someone knows something about you and you don't know why. So if you don't want data mining to be creepy, you have two options: a) Explain why you know something. b) Wait until data mining is so commonplace that people take it for granted, and standards of etiquette shift.