The current study aims to present a critical analysis of research on social networking sites (SNSs) in second language teaching and learning (L2TL) context. Twenty-two studies published from 2011 to 2017 were included in the analysis through the selection criteria devised by the researcher. The descriptive analysis reveals that Facebook was the most commonly explored medium, and more than half of the studies featured English language learners in various levels. Following the content analysis of the studies, the emerging aspects of the literature review are treated under five overarching themes: practicing multiple language areas and literacies; authenticity and negotiation of meaning through interaction; development of intercultural competence and socio-pragmatic awareness; membership in L2 communities; and (re)construction of identities. Following an account of pedagogical considerations such as the dynamics of classroom, technical features, and various cultural uses of the SNSs, the study concludes with suggestions and directions for future research in regards to the incorporation of SNSs such as Facebook and Twitter into L2 classrooms.