As a marketing professional, there is nothing I hate more than receiving any form of communication (email, Web experience, social media, mobile, whatever) and not see an obvious place where I can either opt out of the communication or protect how much information is being captured. As a consumer, I probably hate it more.
How would you feel if mall security cameras didn't simply monitoring you for stealing, but instead kept tabs on the specific brands, styles, colours and sizes of clothes you tried on, the magazines you leafed through at newsstands, what you ordered from the food court, and everything you actually bought during your visit?