The present study is fundamental-applied in terms of research objectives. It is fundamental because it leads to developing a new model in the field under study. It is an applied research, because the results of validating the above model can be used to advance the goals of businesses operating in the online social media platforms. In terms of type and method of data collection, it can be considered as a descriptive survey research because it has conducted through library studies and uses a questionnaire as a data collection tool. In addition, in terms of research method, it is considered as a mixed research, because this used ISM in the initial part of the study and to develop the online social media marketing model inrelation to consumer buying behavior, and SEM in the next step to test the hypotheses and measure the model strength.