Social support protects individuals against adversity throughout the lifespan, and is especially salient during times of intense social change, such as during the transition to adulthood. Focusing on three relationship-specific sources of social support (family, friends, and romantic partners), the current study examined the stress-buffering function of social support against loneliness and whether the association between social support and loneliness with stress held constant would vary by its source. The role of gender in these associations was also considered. The sample consisted of 636 ethnically diverse college youth (age range 18-25; 80 % female). The results suggest that the stress-buffering role of social support against loneliness varies by its source. Only support from friends buffered the association between stress and loneliness. Further, when stress was held constant, the association between social support and loneliness differed by the sources, in that support from friends or romantic partners (but not from family) was negatively associated with loneliness. Regarding gender differences, the adverse impact of lower levels of familial or friends' support on loneliness was greater in females than in males. This research advances our understanding of social support among college-aged youth; implications of the findings and directions for future research are discussed.
Keywords: Gender differences; Loneliness; Multiple additive moderation; Social support; Stress; Young adulthood.