Objective:The current study investigated the dynamic impact of social media use duration on fear of missing out among college students by using the Daily Diary Study method,and to examine the cross-level modera-ting effect of dispositional mindfulness.Methods:Forty-five college students completed the Mindfulness Attention Awareness Scale(MAAS),and repeatedly reported their immediate social media use duration and level of fear of missing out twice a day for 9 successive weekdays in daily life.Results:The results of hierarchical linear modeling a...