Application of centrality measures in bulletion board systems: Find out the right one to act as the moderator for bulletin board system

Conception of centrality comes from structural sociology. It has become a fundamental concept in network analysis since its introduction. Bulletin board system is a popular manner for human communication. Right moderators influence the running efficiency of the BBS. It´s very prevalent, for bulletin board system of university, to appoint moderator for each board manually. Moderators appointed may not be good at their work. This paper introduces centrality measures into the appointment of moderator for bulletin board systems. To fulfill above aim, a network named BBS network is built. Each node denotes a user for the bulletin board system. Several methods are used to compute centrality value of each node in the BBS network. The nodes with highest centrality may be the right users to play the moderator roles. The computing results can also be used to judge if current moderators work well.