This research aims to provide a framework for the consideration of non-users in the context of social interaction design (SxD), in particular for the design of social network sites (SNSs). The theory of “The Absent Peer” consists of two core concepts, presenting the network aspect and the sociality aspect how non-use influences SNS concepts. Herein, the focus of the work is on the discovery of the impact of non-use rather than on its reasons. Building on the insights from the study, this report presents the conceptual considerations for the creation of valuable SNS concepts that acknowledge non-use as a permanent and complex phenomenon of social reality. The work is based on the sociological perspective of symbolic interactionism. Social interaction design is presented as a practice within the discipline of interaction design, with its goals defined through a discussion on user value and worth-centred design.