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Habit and addiction are two distinct drivers of information technology (IT) use that nonetheless bear increasing resemblance in how they are conceptualized and modeled in the information systems (IS) literature. The purpose of this study is to aid the further growth of these heretofore-independent streams of research by developing a comparative framework that allows us to distinguish between them. Drawing on the theories of automaticity and incentive-sensitization, we developed a theoretical model that describes the nature, antecedents, and consequences of habit and addiction of IT use in the context of social networking services. The proposed model was tested based on the data collected from 420 actual users of Twitter. We found that habit was indeed influenced by its proposed unique antecedents of routine seeking and cognitive rigidity, whereas addiction was not. Similarly, addiction was influenced by its …