Comment on "Epidemiological modeling of online social network dynamics"
  In this comment we give a simple analytic approximate solution to the infectious recovery SIR (irSIR) model given by J. Cannarella and J. A. Spechler arXiv:1401.4208, which is a variant of the traditional SIR model. 
Kazuyuki Fujii (YCU)
physics.soc-ph