Entrepreneurship is an important issue that has been raised in all aspects of economic and social development. Now, the most important question in the communities, especially in developing countries is how people can be entrepreneurs and how can they create entrepreneurial opportunities. Nowadays because of technological development people can communicate with each other in many different ways,  social network is one of them. Therefore, the aim of this study was to explain the determinants for entrepreneurial behavior of members of agricultural social networks. This study was among members of social networks "entrepreneurial knowledge exchange". The population  included 180 members and study sample was calculated 126 members using simple random sampling. The assessment tool in this study was a questionnaire which its validity was confirmed by experts and its reliability was confirmed through pilot testing and Cranach's alpha was between 0.76 - 0.93. The analysis of regression showed that virtual social networking features, some entrepreneurial characteristics such as risk, identify and evaluate opportunities and incentives can predict 76.6 percent of the variation in entrepreneurial behavior as a dependent variable. It recommends identifying and evaluating entrepreneurial opportunities by identifying the types of opportunities and familiarizing them with possible conditions and opportunities and how to identify them.