I re-wrote a 2012 article of mine on how Marketing has turned into anti-social Stalking last year here for publishing in MEDIUM. I still believe that Marketers who try to make up for their fear of failing by using Big Data and Analytics are on the wrong track. Their behavior will IMO result in people demanding (and getting) tools and devices to lock-away, hide or falsifie their circulating data!
The power BigData brings to sales is providing a background to check a hypothesis by a creative marketer to optimize their personal insight into markets. Clustering people according to single items or sets of items obtained by stalking them will carry more loss in understanding and insight than the amount of data available suggests!
Indeed the new professional, multi-billion-dollar stalking industry that has sprung up just shows how much detached marketers have already become from customers and how far they are from understanding markets — both market-data and BigData generated!