Emotion Sniffing from a Phone

In Fastcompany: This could be a very useful thing to understand how people are reacting to an environment.  Pay people to use the idea.  And their phone is always there.  Once again an interesting stream of data.  " ... Rice University scientists, working with Microsoft Research, have created something rather surprising--a long-term-mood detecting device that can ascertain a user's emotions with up to 93% accuracy. What's more, there's no EEG device in use here, no blood pressure sensors. It's all down to simple smartphone data analysis. .... The MoodScope system is a two-parter, with a smartphone acting as a data-collection device and a cloud-based model. Since we take our smartphones everywhere and increasingly use them to surf the web, engage in social media, use apps and so on, they are a fabulous tool for this purpose. ... "