To look at the diffusion of information, they used an epidemiological model. The equation $I=[\frac{R_0}{(1+d)^t}]^t$ was used to define their exponential model in which I is incidence, t is the number of days, $R_0$ is the reproduction number and d is a damping factor. They also used the SIR model, described by three differential equations: $∂_tS=−βS · I/N$ $∂_tI = βS · I/N − γ I$ $∂_tR = γ I$ β is the rate in which a susceptible population can be infected when coming into contact with an infected individual. γ is the rate in which someone who is infected can recover. S is the number of susceptible, I is the number of infected, and R is the number of recovered.

To measure engagement, linear regression was used.