Of course, there are a few pitfalls, which fall primarily into three categories.
The first has to do with understanding privacy rights: making sure everyone knows how their personal and consumer data will be used. Ideally, marketing creates a value exchange — providing benefit to consumers in exchange for collecting their information for the purposes of targeting media or custom messages.
This is what online services like Google and Facebook would argue they already do — free services in exchange for data collection and targeting. There is no true corollary for offline media at present, but when you look at the mergers of Time Warner and ATT, and the future direction of Comcast, both companies plan to inject as much data as they can into their advertising delivery and distribution vehicles.