In a comment thread at Drudge Retort, Vern Kaine just linked to this video. The scenario is conceivable. Science fiction writers have been describing this future for decades. (I’d love to have embedded the video here to save you the trouble of going to the link, but ACLU doesn’t seem to offer a way to do that. And I thought my people liked to share.)
When I buy products at my drug store, there are coupons from the manufacturer in my mail box a few days later. When I go to Amazon, they know what I like. Et-bloody-cetera.