Abstract: Social Network Analysis has been used in several fields such as sociology, anthropology, and social psychology. However, it has been started to be used in security studies and criminology. Social network analysis came out as an alternative of traditional study methods. The value of social network theory versus other political science and sociological approaches is its focus on the value of the network structure rather that the characteristics of the individual. There is a growing interest in social networking research, particularly when networks play in facilitating terrorist tactics and strategic behavior. Within this regard, social network analysis of terrorist networks gained big importance in security studies. Social network analysis could be used as a very effective tool to understand vulnerabilities and weaknesses of terrorist networks. The Internet has become the main propaganda source for the organization as well as providing different information for the target audience. Presence of a terrorist organization is very important for ideological activities.