“…The focus of the present study was Physical education teacher in-service training, which was delivered in the form of an online CoP via social networking, utilizing “Facebook groups” function as a tool. Although recent research applying SDT in online learning environments seems promising (e.g., Chen & Jang, 2010 ; Hsu, Wang, & Levesque-Bristol, 2019 ; Martin et al., 2018 ; Wang et al., 2019 ), there is a scarcity of research in the context of SNSs such as Facebook, testing SDT applicability not only to samples of students, or undergraduates (e.g., Saini & Abraham, 2019 ) but to in-service teachers as well. To address this gap, an online in-service PE teacher training which was founded on SDT, implemented and evaluated in terms of participants’ motivation and active engagement with the learning process.…”