The popularity of the Social Network, which nowadays have a lot influence to teenagers in Thailand. In society of University as a medium of education or as medium for communication such as : The group on facebook to share a knowledge or lessons between the instructor and students . The popular usage Social Network, which is popular today especially in teenagers in academy. For this reason, the researchers interested in the study about behavior of using Social Network of only some group students of Prince of Songkla University. In order to understand using Social Network in the perspective of the user ,or to guide or give information to the providers of Social Network that can be planned and developed to meet the needs of service users in the future.