1. IBM recently released Watson Developer Cloud. A part of it is a User Modelling Service which "uses linguistic analytics to extract cognitive and social characteristics, including Big Five personality, values, and needs, from text"
2. We put the comments of top 100 HN commenters (update: merged with a list of 100 users with a highest comment count) through that service to see what happens.
3. You can sort users by any characteristic. Try it now.