Texas A&M International University
In this paper, the authors perform an empirical analysis of the cyber criminal ecosystem on Twitter. Essentially, through analyzing inner social relationships in the criminal account community, they find that criminal accounts tend to be socially connected, forming a small-world network. They also find that criminal hubs, sitting in the center of the social graph, are more inclined to follow criminal accounts. Through analyzing outer social relationships between criminal accounts and their social friends outside the criminal account community, they reveal three categories of accounts that have close friendships with criminal accounts.