Mementos are keepsakes that support memory and reminiscence of lived experiences, people, and locations. Memories have both individual and social functions, where sharing experiences with others facilitates and maintains relationships and social connections, and belonging to other people. With access to digital technology, the collection of mementos has changed from physical to increasingly digital items. This has created new challenges in the usage and interaction of mementos. This project aimed to understand what elements influence interaction with digital mementos and how they can support social interaction. The research through design methodology was utilized as a foundation of the design process, and with a questionnaire, interviews, a variety of design exploration methods, and prototyping led to the validation of the concept Re:Vive - a mobile app prototype that supports collection and interaction with digital mementos. The outcome of the project showed that the process of collection, curation, and interaction influences engagement with digital mementos. Varied memento types, prompts, and reflections can be used when designing to encourage active engagement. Digital mementos can support social interaction through the use of mementos by supporting conversations, creating active participation in the experience, and inspiring future social events. This work provides a foundation for future studies on social interactions and digital mementos. / <p>Examensarbetet är utfört vid Institutionen för teknik och naturvetenskap (ITN) vid Tekniska fakulteten, Linköpings universitet</p>