The feeling of connectedness experienced in computer-mediated relationships can be explained by the similarity-attraction effect SAE. Though SAE is well established in psychology, the effects of some types of similarity have not yet been explored. In 2 studies, we demonstrate similarity-attraction based on the timing of activities-when-similarity. We describe a novel experimental paradigm for manifesting when-similarity while controlling for the activities being performed what-similarity. Study 1 N = 24 shows when-similarity attraction in the evaluation of connectedness with others. Study 2 N = 42 identifies an interaction between who-similarity-similarity in personal backgrounds-and when-similarity. Both studies show that real-time computer-mediated interaction can lead to greater feelings of connectedness between people when there is an opportunity to discover when-similarity.