Table 3: Initial clustering center.

Cluster
1 2 3 4
Degree Centrality .0728 .0326 .0229 .0001
Closeness Centrality .3211 .3153 .3214 .0002
Betweenness Centrality .1626 .0582 .0636 .0000
User-Contributed Content Value 806.00 409.00 243.00 .0000