Since its initial introduction, the paradigm of agenda-setting has become more refined and complex. In addition to the introduction of intervening factors the agenda-setting paradigm is now challenged by a rapidly changing media environment. This paper reviews the impact of online media technologies and digital platforms on the basic assumptions of the theory. The review sets out to reassess the conceptualization of the agenda-setting theorem by highlighting the development of new processes, attributes and features applicable to the online media. This review, based on the findings of numerous studies on new media and agenda-setting, suggests several modifications of the basic theory.