The document discusses personality prediction using data from Reddit. It describes extracting comments and posts from 122 MBTI-related subreddits and analyzing over 13,000 users. Linguistic and behavioral features are extracted from the data and used to predict personality dimensions like extraversion vs introversion using models like SVM. Results show the approach can predict personality dimensions with above chance accuracy. Further work could involve more data, multi-task models, and handling large volumes of comment text.