Human personality judgments were obtained from the partic- ipants’ Facebook friends, who were asked to describe a given par- ticipant using a 10-item version of the IPIP personality measure. To compute self-other agreement and external validity, we used a sample of 17,622 participants judged by one friend; to calculate interjudge agreement, we used a sample of 14,410 participants judged by two friends. A diagram illustrating the methods is presented in Fig. 1.