The 'redeeming' aspect of this is that it is doomed to fail. The machine learning systems here are just 'automation by averages' -- they are incapable of measu

The 'redeeming' aspect of this is that it is doomed to fail. The machine learning systems here are just 'automation by averages' -- they are incapable of measuring any variables which could actually estimate your emotion. Emotions are 'conceptualized bodily states' that the brain adopts in order to atune our motivation/etc. to our environment. Indeed it isn't clear there are any devices we can attach to computer to even take measurements. At best, something like a continuous webcam feed would improve accuracy a little from "almost coinflip", and only for quite extreme emotions. The problem with these systems is precisely that we are fed 'averages'. NOT that they are 'capturing sentiment' (ad-tech propaganda to sell their apps and ads). My concern is that this propaganda is leading to people changing their behaviour: unaware they are being fed 'generic content' for some accidental, meaningless 'singanal' they sent, their habits/emotions/self-perception is being distorted to fit the stupidity of the average.