Internet and media addiction research has grown in the past decades. We investigated the causal processes involved in the development of TV and Internet addiction. We conducted three studies to develop and validate new measures of TV and Internet affinity, or importance, based on the compulsion and salience dimensions. We discovered that TV and Internet compulsion parallels the incentive-sensitization theorys excessive wanting factor, and that compulsion and strength of habit of use are the main determinants of media dependence. We report that compulsion and habit totally mediated the impact...