Professional roles are a key topic in journalism research along with the fundamental elements in defining journalism as a profession. For many decades, scholars have devoted their efforts to analyzing normative standards and journalistic ideals, while their analysis through the lens of professional performance has remained in the background. Nevertheless, considerably more attention has been paid over the past decade to the theorization of the different concepts in play when analyzing professional roles in journalism, especially the study of journalistic role performance (i.e., the manifestation of professional roles in both news decisions and the news outcome that reaches the public). Studies on journalistic role performance are able to tell us how or to what extent news professionals have enough autonomy for their role conceptions or perceptions to be manifested in journalistic practices, as well as in the news product made available to the public. So far, research on journalistic role performance has systematically found patterns of multilayered hybridization in journalistic cultures across and within advanced, transitional, and non-democratic countries. Several studies have also shown significant discrepancies depending on societal, organizational, and individual factors, as well as a wide gap between journalistic ideals and professional practices. Some of these studies have also found significant discrepancies between journalists’ role conceptions and their perceived role enactments. Future studies need to address the intrinsic capacity of social media platforms to deinstitutionalize communication through parallel channels, which may turn out to be a crucial element when it comes to performing both traditional and new journalistic roles.