[informatimago]

It's called "sentiment analysis", and it's a very well developped and commercialized part of AI.

And of course, text generator use it to choose words according to the conoted emotional load, according to the goal set by the emotional branding.

70% of twitter traffic is generated automatically by such systems, working for the US military and corporations.

http://www.pnas.org/content/111/24/8788.full

[barbudorojo]

Thanks for the information, seems like facebook is a big data source for social experiment but there is some doubts about the legality of collecting and analyzing the data for psychological experiments. Being a lisper, by hobby, I see great opportunities for Lisp to become a very useful tool for sentiment analysis.