Despite its overwhelming popularity as the leading social network site in the past few years, the educational value that Facebook provides has not been fully determined, and results are still contradictory. Moreover, systematic reviews about the educational usage of Facebook are still lacking some aspects. This article provides a critical overview of the international studies focusing on Facebook as educational environment, carried out in order to examine if and how this popular social network may contribute to teaching and learning within formal education. The authors conducted a comprehensive search that identified 43 relevant articles, subsequently analysed according to a list of guidelines created especially for this study. Thus, only empirical studies published between 2015 and 2018 in peer reviewed journals have been considered for this review. The studies included present the ways in which Facebook can be used in education, and focuses on the perception of pupils, students and teachers in this respect. Overall, our study found that Facebook is partially implemented in education, depending on the subject taught. Finally we provide suggestions and indications for future research .