Fig. 3.

Gender differences in network externalities on Facebook. Scaling of the Facebook activity ratio per gender vs. total Facebook penetration. Solid lines show fit results, and shaded areas show their 95% CIs. Both male and female activity ratios grow superlinearly with Facebook penetration ($\alpha >1$), indicating positive network externalities. These network externalities are stronger for female than for male users (${\alpha }_F>{\alpha }_M$).