Abstract: The aim of this study is to create an online teaching style inventory by investigating other teaching styles in the literature within the scope of EU FP7 Era.Net RUS (Russia) project called Somecat (Social Media as a Catalyser for Cross National Learning). To do so, different perspectives on teaching styles were analysed. According to information collected, the “Online Teaching Style Survey” (OTSS) was prepared. The study was conducted with 39 participants and to construct validity, Exploratory Factor Analysis (EFA) was applied, and for reliability, Cronbach Alpha was used to maintain internal consistency. According to the analysis, factors were named for the classification of online teaching styles. The findings showed that online instructors are constructivist in general and behave in four different perspectives as; designer, assessor, innovator and facilitator, when they are teaching online.