Figure 4
From: Collective aspects of privacy in the Twitter social network
Location prediction quality as a function of disclosure tendency and number of friends. The left panel shows the median error of location prediction in 1000 samples for each value of \(\rho \in [0.1,0.9]\), with bars showing 95% bootstrapping confidence intervals (not visible). The median error approaches the value of the error when \(\rho=1\), using all alters, which is 72 Km. The inset shows the error of the Null Model, which is several orders of magnitude larger that the error of shadow profiles. The right panel shows stratified regression lines of median error as a function of the number of alters in the samples, revealing that error decreases with number of alters for the different values of ρ.