The document provides a critical review and analysis of 22 studies published between 2011-2017 on the use of social networking sites (SNS) for language teaching and learning. The review found that Facebook was the most commonly studied SNS, most studies focused on English language learners, and were conducted in the United States. The review identified five key themes across the studies: practicing language skills through SNS use, developing authentic interactions and intercultural competence, participating in online language communities, and constructing identities. The review concludes by discussing pedagogical considerations for incorporating SNS into language classrooms.