Participants were 318 college students from two small, Catholic liberal arts institutions in the Upper Midwest. Variation (i.e., having friends with varied interests and activities) of an individual's social network was measured by a researcher-developed inventory, the Social Network Variation Scale (SNVS). Social network strength was measured by the researcher-developed Social Network Strength Scale (SNSS). People with more variation or more strength in their social network had higher levels of happiness and lower levels of stress. Autonomy mediated the relationships between variation and stress and strength and stress. Personality moderated the relationships between variation and happiness and variation and stress.