Personal Web usage (PWU) represents a tension between employers and employees as employers generally regard employees' PWU as negative and employees see many PWU behaviors as acceptable. Employers attempt to limit PWU primarily through electronic monitoring and Internet usage policies. Employees, however, find PWU not only permissible, but also useful and rationalize these workplace behaviors. While researchers identified many PWU behaviors, the underlying structure of the phenomenon is not clearly understood. In this article, we offer a comprehensive new definition of PWU, and develop an empirically grounded classification of PWU framed by psychological contract theory and based on two studies. Using multidimensional scaling techniques and cluster analysis, we identified four clusters of PWU behaviors-work/family, hedonic, self-development, and citizenship. The results provide information as to what constitutes the domain of PWU, and how various usages are related to one another via the dimensions of individual and organizational benefits. We offer directions for future work and suggest how our work might be useful to practitioners.