Less Wrong is a community blog devoted to refining the art of human rationality. Please visit our About page for more information.
In 2007, psychology researchers Michal Kosinski and David Stillwell released a personality testing app on Facebook app called myPersonality. The app ended up being used by 4 million Facebook users, most of whom consented to their personality question answers and some information from their Facebook profiles to be used for research purposes.
The very large sample size and matching data from Facebook profiles make it possible to investigate many questions about personality differences that were previously inaccessible. Koskinski and Stillwell have used it in a number of interesting publications, which I highly recommend (e.g. ,  ).
In this post, I focus on what the dataset tells us about how big five personality traits vary by geographic region in the United States.
View more: Next