Nowadays, integrated marketing communication is considered as a useful method for every company around the world to approach as well as to receive feedback and responses of customers. Therefore, the relationship between social media and customers play an importance role in any marketing strategy. Among of models, Duncan model is evaluated one of the most effective models to reinforce customer supports. On the other hand, understanding consumer purchasing process via communication tools such as news, magazines, television, radio, person to person and social media is very essential for marketers. On the point of integrated marketing communication, this website will analyze the Duncan model and five steps of consumer decision making process.