Fig. 2
From: An anonymous entropy-based location privacy protection scheme in mobile social networks
Illustration of the neighbor user selection. It depicts a scenario that MSN users request LBS service. Dots represent the users, where red dot A represents the real user and other seven black dots represent the neighbor users. Eight users with labels {A,B,⋯,G} are deployed in the region. Lines between the dots indicate the spatial neighbor relation between the users, where the digits marked on the lines indicate the distance