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Increasingly visual social media platforms such as Instagram (IG) constitute a large part of young women’s daily lives, but their psychological effects have not yet been studied at the daily level. This study examines the effects of daily IG use on state self-objectification and well-being among Western college-aged women. Participants completed an initial assessment (N= 45) followed by daily-diary responses (N= 481) for up to 13 nights, reporting each day’s IG use, self-objectifying thoughts and feelings on that day, daily well-being, and daily mood. Results from multilevel models indicated that, as hypothesized, using more IG on a particular day was related to increased self-reported state self-objectification on that same day. Daily IG use was also related to lower daily life satisfaction and higher daily negative mood. Further, results provide evidence that state self-objectifying feelings partially explain the relationship …