The importance of oral interaction in language learning is well recognised, and this paper examines the factors that hinder English as a Foreign Language (EFL) learners' active participation in online discussions during Synchronous Online Communication. Using focus groups with 51 Cypriot Greek-speaking students from three tertiary institutions in Cyprus, thematic analysis revealed that the perceived prominent factor inhibiting oral interaction in the online environment was the absence of eye gaze and its associated social functions. Specifically, eye gaze was identified as a signal for turn-taking, turn-yielding, and turn-denying, whose absence hindered learners' ability to interpret their peers' and teachers' intentions and expectations. The paper concludes with pedagogical implications for technologists, software developers, students, language teachers, and language teacher educators.