Touch is one of the primary channel of non-verbal communication. It is used to convey emotions and to establish bounds between people. Its use has already been considered in HCI to interact with devices, but it has rarely been used for direct emotional communication between individuals. This article presents a literature review of social touch in human-computer interaction. Based at the crosssection of psychology, HCI, emotions and haptics research communities, we rst review the role and importance of social touch for communicating emotions. We then discuss existing and emerging technologies to perform social touch and nally we present new perspectives for interfaces in HCI. CCS CONCEPTS • Human-centered computing → Interaction paradigms; Human computer interaction (HCI);