Public diplomacy has become today more about public communication, global public issues and engagement with various publics across the world than ever before. This chapter reviews briefly the reconceptualization of engagement within the field of public diplomacy over time and argues that the recent critical turn from scholars within and, mostly, from outside the field can open new avenues for study and practice. Building on a sociological perspective (Castells, 2008; Wiseman, 2015) and on the concept of dialogic engagement (Taylor & Kent, 2014) public diplomacy is conceptualized as constructed discourses of engagement: a dynamic dialogic process and, at the same time, an outcome of the interactions and negotiations between state and non-state actors, with different power positions and agendas, who compete and influence each other, yet contribute to the co-construction of a public sphere. Consequently, critical discourse analysis is proposed as a framework for analyzing public diplomacy as discourses of engagement, discourse that constitutes social practice and is constituted by it. This theoretical discussion is illustrated with a case study from Romania, the campaign "Why don't you come over?" of the Romanian newspaper Gandul.info and GMP communication group to show different levels of engagement embedded in the concept of public diplomacy as constructed discourses of engagement: participation, interaction, and co-creation. The analysis reveals how a non-state actor engaged in a public diplomacy topic, created a platform for online engagement and empowered Romanian citizens to engage in a debate about themselves: thus, they co-created discourses about their country that ultimately reached the public agenda and produced multiplication communication effects offline (e.g. a media company offered free outdoor advertising in bus-shelters and hotels; a pub displayed the posters; British journalists and politicians visited Romania).