The purpose of this study was to develop a valid and reliable scale that can be used to identify the perceptions of teachers on their self-disclosure to their students in their interactions with them through social media. This study was designed as a sequential exploratory mixed method. So validity and reliability studies were conducted for this purpose. Data from 301 teachers for EFA and 422 teachers CFA were used psychometric properties of "The Scale of Teachers? Self-disclosure through Social Media" (STSSM). The exploratory factor analysis yielded four-factor model with 21 items. As a result of the analyses of confirmatory FA, it was found that the scale produced sufficient goodness of fit values. Finally, the findings on the reliability proved that "The Scale of Teachers? Self-disclosure through Social Media" can reliably measure the perceptions of teachers on self-disclosure to their students on social media.