Table 1. Properties of real-world networks used in this study.

Network	Name	Number of nodes	⟨k⟩	Modularity [34]
QX.com favorite	QXF	80,407	13.07	0.4060
QX.com guestbook	QXG	59,854	7.10	0.3893
POK.com	POK	29,242	5.95	0.3992
Livejournal.com	LJ	315,936	3.56	0.6578
Prostitution	PRO	16,729	4.67	0.6294

⟨k⟩ is the average degree of the network. We use the fast-greedy community detection algorithm [34] for measuring modularity.