This form of biometric tracking will rely on a standard webcam in order to map out one’s facial expressions – with your permission, of course, before it is processed and a slew of results are shown to the client. Such technology is being used at the moment to map just how volunteers react to big budget advertising campaigns, right before they are launched, so that last minute changes can be made if required. The BBC even held an informal experiment with developer Realeyes for Radio 4’s consumer programme You & Yours, measuring the emotions of 150 Radio 4 listeners, and came up with some interesting results. The thing is, is the algorithm that interprets one’s emotion accurate enough in the long run?