2022 年 2022 巻 BI-020 号 p. 12-
While the negative effects of selective exposure to information on digital platforms and the importance of the diversity of information are well understood, the relationship between the diversity of information offered to users and user engagement has not been well analyzed. In this study, we analyzed user behavior logs in a popular news application to clarify the relationship between diversity and engagement. We found that users who viewed articles homogeneously tended to have significantly lower retention rates both before and after the great change in the application 's recommendation system. On the other hand, we found that users with extremely high article diversity do not necessarily have high retention rates, and that the relationship between diversity and retention rates differed in part before and after the change.