Person of Interest
As much as the series if full of hyperbole, the authors were clearly up to date about what was possible even several years ago..
Big Brother is not just watching he is Geo-positioning, Recording, Tracking, Establishing, Analyzing ( Anal being the operative word here) everything and anything wherever possible... Even though the majority of this information is just being used for eventual advertising(spam) it really doesn't require the need for owning a tin-foil hat in order to be paranoid...