Advancements in technology and the pervasive influence of internet and social media on individuals have propelled societies into post-truth era. This epoch is characterized by distinct features that have brought about significant changes in both societal dynamics and communication methods. Notably, the emergence and proliferation of social media and internet have played a key role in shaping and exacerbating these changes. Given that information dissemination and communication via internet and social media platforms now constitute a substantial component of contemporary public diplomacy practices, the realms of public diplomacy and post-truth share commonalities in terms of platforms used, target audience, and content delivered to them. Consequently, alterations in these factors within the post-truth era have a discernible impact on the field of public diplomacy. This study aims to investigate and analyze this impact, using grounded theory method to propose a novel analytical model for assessing public diplomacy activities within the framework of post-truth era. An examination of how these factors are applied in the realm of public diplomacy reveals a notable shift in policies and practices, from traditional objective of cultivating a positive image, towards a more assertive approach. This study introduces this new approach as a theoretical framework, termed "Antagonistic Public Diplomacy".
