In the evolution of diplomacy throughout human history also diplomatic functions were developing. This was determined by a concrete historical and social situation, in which diplomacy operated as well as by the concrete need to use more or less broad spectrum of diplomatic activities. From early forms of negotiation to a full developed range of all of the five functions, what we can follow during the last century, diplomatic functions evolved as far as their outer appearance, substance and mode of implementing are concerned. We could claim that during the period after the end of the Cold War the change has been most obvious. This is the period of postmodern diplomacy, which is primarily influenced by globalization. Social media play a key role here, while diplomats continue to implement interests of their sending states at the receiving states or international organizations.