Drowning Out Rumor: Dynamical Models of the Interaction between Spreaders of and Exposed to Truth and Rumor Spreading

Juan Miguel Augusto M. Feria, Michael Lawrence S. Oliva, Briane Paul V. Samson & Angelyn R. Lao

Philippine Journal of Science (PJS), 2019

The system of ordinary differential equations and toy model representation of the Spreader-Spreader and Exposed-Spreader models.

In our model, we introduced the Exposed compartments to both truth and rumor. We developed two mathematical models based on the SEIR model that describes spreader-spreader and exposed-spreader interactions. From a macro-level, we observed the general effects of changing the rates of spreading truth on the population as a whole.


Social networking sites have become instrumental in spreading information online, which unfortunately includes rumors and misinformation. Past studies have investigated the spread of rumors without considering that truth may spread simultaneously. This study considers both the spread of truth and rumor and investigates the result of their coexistence in a population. We formulated the spreader-spreader interaction model and the exposed-spreader interaction model based on the epidemiological SEIR model. In the spreader-spreader interaction model, the spreaders try to influence the opposing spreaders whereas, in the exposed-spreader interaction model, the spreaders try to influence the exposed individuals from the opposing side. In our study, we calculated the reproduction numbers for truth and rumor, determined the stability of the model at the equilibrium points, and determined an approach for spreading truth while halting rumors. In the spreader-spreader model, we have shown that increasing the removal rate of Spreaders of Rumor decreases the prevalence of rumor in the population. Whereas in the exposed-spreader model, we showed that increasing the conversion rate of Exposed to Rumor to Exposed to Truth significantly increases the amount of Exposed to Truth in the population, thereby making it an effective mechanism for promoting the spread of truth. In conclusion, it is harder to control the information epidemic in the exposed-spreader model but, compared to the spreader-spreader model, information spreads faster according to the exposed-spreader model. For certain information to be endemic to a population, our study proposes that spreaders take advantage during the first few days of the information diffusion process.


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Feria, J.M.A.M., Oliva, M.L.S., Samson, B.P.V. & Lao, A.R. (2019). Drowning Out Rumor: Dynamical Models of the Interaction between Spreaders of and Exposed to Truth and Rumor Spreading. Philippine Journal of Science, 148(4), 659–687. Retrieved from http://philjournalsci.dost.gov.ph/images/pdf/pjs_pdf/vol148no4/drowning_out_rumor_.pdf