The growth of Internet usage in American society has added new modes of communication, primarily through computer-mediated communication (CMC)on the Internet. Research on the relationship between Internet use and psychological well-being has been mixed and this study attempted to reconcile the discrepancies in results by exploring the relationships between types of CMC and psychological well-being (PWB). Based on theories of communication such as media richness theory and media naturalness theory, it was predicted that richer modes of communication would have a positive relationship with PWB. A series of hierarchical multiple regressions run on a sample of 196 Internet users, however, did not support this hypothesis. Use of virtual worlds was the only communication modality that significantly predicted PWB and it was not as expected, having a negative relationship with PWB. The study highlights the need for further research and the importance of pursuing other factors such as relationship quality and purpose of Internet usage in trying to more clearly determine the factors involved in predicting PWB. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com/en-US/products/dissertations/individuals.shtml.]