Non-work-related personal use of the Internet within organizations has received increased attention from scholars. We increase previous understanding of this phenomenon by proposing a novel model based on the theory of interpersonal behavior (TIB). The TIB includes previous researched constructs (i.e., attitudes, social influence, and intentions) as well as emotional factors, habits, and different sources of social influence. Our results (N = 238) suggest that the model well predicts the use of the Internet at work for non-work purposes. Our results shed new light on the influence of habit, affect, role, and self-concept in the use of the Internet. 2013 Elsevier B.V. All rights reserved.