This chapter reframes diplomacy as a visible and everyday practice structured by platform logics. Adopting a constructivist and mediatization lens, diplomacy is defined as a process activated when the international order fractures. The chapter proposes a continuum of platform intervention with four intertwined functions: data-extractors (invisible listening and datafication that inform strategies and crisis anticipation); stage-amplifiers (algorithmically curated dramaturgies that compress negotiations into updates and events); pop-makers (memes, irony, and native formats that popularize diplomacy and fold it into ordinary feeds); and standard-definers (rules, algorithms, moderation, and labeling that set participation thresholds and confer visibility). The analysis shows how platforms reshape diplomatic status, performance, and legitimacy, intensify performative dynamics, and normalize incivility and outrage as common formats. Ultimately, platform sovereignty and attention economies reconfigure who speaks, what becomes visible, and how global politics is enacted and perceived.