Mobile diaries can be used as a tool for social design by engaging stakeholders to provide insights into their everyday lives, routines, and experiences. Participants use their mobile devices to collect and share images, audio, and text about different contexts like home, work, school, and more both publicly and privately. These diaries provide rich data about peoples' rhythms, habits, and reflections that can help designers better understand users and potentially spark conversations that lead to positive change or interventions.