  We describe an empirical study of the usage of a mobility self-tracking app,
SensibleJournal 2014, which provides personal mobility information to N=796
participants as part of a large mobile sensing study. Specifically, we report
on the app design, as well as deployment, uptake and usage of the app. The
latter analysis is based on logging of user interactions as well as answers
gathered from a questionnaire provided to the participants. During the study
enrollment process, participants were asked to fill out a questionnaire
including a Big Five inventory and Narcissism NAR-Q personality tests. A
comparison of personality traits was conducted to understand potential
differences among the users and non-users of the app. We found a relation
between self-tracking and conscientiousness, but contrary to the view in
popular media, we found no relation between self-tracking behavior and
narcissism.
