In this paper, the research to maximize the effect of learning using SNS services are performed. The characters of various SNS services are introduced and the examples of the researches appling the SNS services in a variety of educational fields are analysed. The SNS services are divided into closed type, opened type, micro-blog type. The various SNS services can be used as the main tool to accomplish the purpose of a class in the class and the auxiliary tool to increase the interest of the class and provide smooth communications between a teacher and students. In on-line or blended learning environments, they can be used as the complementary tool to redeem the absence of close ties through the class and the pathway of communications between the teacher and students. In team projects, they can also be used as the troubleshooting tools to provide smooth communications and exchange their ideas between team members. This paper provides a basis research for maximizing the effect of learning by applying suitable the SNS service based on the characteristic of various educational fields when the SNS services are in a various educational fields.