Fig. 2.

Community structure. (Left) Backbone of the projections on pages of the users’ likes ($G_l^p$). (Right) Comments ($G_c^p$). The color of the nodes indicate the Fast Greedy community. Nodes in $G_l^p$ are ordered according to the detected communities, whereas in $G_c^p$, the nodes follow the same order as in $G_l^p$.