Fig. 4: The illustrative retweet topology on Twitter, exemplified by the retweet networks of P2.

The graph was generated by using ForceAtlas2, a graph generation algorithm to cluster the densely connected nodes nearby and drive sparsely connected nodes out of the center in a 2-D plane (Garrett, 2013). Users in the Main communities are colored light rose, while the rest of the users are colored gray. The node sizes are directly proportional to users’ ODC. The larger a node, the more connections a user had in information dissemination (See SI3 for graph generation details).