Abstract: The social network public opinion has become the main position of social public opinion. Because the traditional public opinion prediction model is difficult to describe the real spreading process of social network, a social network topic propagation model based on infectious disease dynamics with positive and negative feedbacks is proposed. This paper analyzes the real characteristics of social network public opinion topic, adds two significant features: Internet mercenaries and zombie fans as positive and negative feedback in the dissemination of public opinion topics, which promote and inhibit the spread of opinion topics respectively. The SEIR microblog pubic opinion communication model with positive and negative feedbacks is constructed, which improves the public opinion prediction accuracy compared with traditional models, and gets the influence of positive and negative feedback on public opinion communication.

Key words: social networks, public opinion topic, Internet mercenaries, zombie fans, propagation model, SEIR