Four cross-sectional surveys over a one-year period with adolescents and young-adults. Online sociability was a strongest predictor of IFU for adolescents and young adults. Life satisfaction was a non-significant predictor for adolescents and young adults. Bonding and bridging were non-significant predictors of IFU for young adults. Adolescents from different SES differed in the role of bonding on IFU.