Kraut, R., Kiesler,S., Boneva, B., Cummings, J., Helgeson, V. & Crawford, A. (In press). Journal of Social Issues. Kraut et al. (1998) reported small but reliable negative effects of using the Internet on measures of social involvement and psychological well-being among new Internet users in 1995-1996. We called the effects a paradox because participants used the Internet heavily for communication, which generally has positive effects. A 3-year follow-up of the original sample found that negative effects dissipated. We also report findings from a longitudinal study in 1998-99 of new computer and television purchasers. This sample experienced overall positive effects of using the Internet on communication, social involvement, and well-being. Consistent with a rich get richer model, the Internet generally predicted better outcomes for extraverts and those with more social support but worse outcomes for introverts or those with less support. You can request a preprint of this paper by sending email to marilyn.jameson@cs.cmu.edu. <http://homenet.andrew.cmu.edu/progress/research.html> Glad to see us all that happy, Reinhold Grether <http://www.netzwissenschaft.com/>