Knowledge is critical for employee and firm success. We show that being perceived as prototypical organizational members is a source of prominence in knowledge exchange that operates beyond preexisting communication or affective relationships. Self-categorization processes produce – through depersonalization – a positive attitude among the members which represents an autonomous mechanism of social attraction for knowledge exchange, while social network mechanisms are triggered by interpersonal attraction. Our findings also suggest that including perceived members’ prototypicality can avoid a potentially spurious relationship in assessing the role played by social identity and categorization theory in explaining attitude and behaviors.