Under the authoritarian regime, earlier iterations of Vietnamâ€™s public diplomacy (PD), especially during wartime, reassembled propaganda and psychological warfare. But thanks to Doi Moi (i.e. â€œrenovationâ€) in 1986, new understandings of PD were made possible with a revamped foreign policy of multi-lateralisation and diversification. This article argues that information and communications technologies (ICTs), especially the internet and social media, have further transformed the practice of Vietnamese PD. Focusing on the period from 1997 when the internet was introduced in Vietnam, this article first provides a general analysis of the influence of ICTs on Vietnamâ€™s politics. It then delves into how ICTs have transformed Vietnamâ€™s PD. The key takeaway is that the internet and social media have significantly empowered public opinion in foreign policy, giving rise to cross-border cyber communities that can play the roles of both recipient and practitioner of PD.