In the present technology era, a new trend of using social media or social networking sites (SNSs) has been developed. Social media has a lot to offer when it comes to education in general and second language acquisition (SLA) in particular. This study aimed at investigating the impact of Telegram, as an available social network, on learning L2 vocabulary by Iranian EFL beginners. To achieve this aim, a quasi-experimental research design was used. Thirty one Iranian students, aged 10-14, were selected through the convenience sampling method. The teacher taught English vocabulary to the participants in two ways: for four weeks by using Telegram and for another four weeks through the traditional face-to-face classroom instruction. Comparison of the scores obtained from words taught through Telegram and the scores of the traditionally-taught lexical items gave rise to the conclusion that learning vocabulary through the social network was more effective than the traditional approach. This study could help the teachers and material developers to consider incorporation of technology and common applications in language classes for the purpose of L2 vocabulary acquisition.
