Factors that influence scope of information dissemination in online social networks and phase transition in process of communication

Online social networks have a profound impact on our daily lives. Netizen is very concerned about how to get a better dissemination of message. Researchers usually use the SIR dissemination model, describing the basic model of the dissemination process, to explore the mechanism of message dissemination. In this paper, we used the SIR dissemination model to carry out the experiment based on the scale-free feature of the social network. We test our dissemination model from SIR on twitter network and compare the disseminating results under two main factors. Finally, we have got three results: 1, there is a phase transition in the message dissemination process. That is to say, all the messages that forwarded by a large number of users have jump of the number of page views. 2, The message content is more influential than the media. The probability of message being forwarded is more likely to affect its final dissemination than the popularity of the message senders. So, it is a good way to improve the quality of information if you want your message to be seen by as many people as possible. 3. The probability of meeage being forwarded has a threshold that affects its ability to spread. The probability above this threshold will easily get mass dissemination.