Thus, talking to this large blue node with high betweenness is likely to yield insights about what both groups are doing and what is going on between those two groups.ĭerek L. For example, in Figure 21.2, the large blue node in the upper right connects the blue group to the purple group. In an investigation, a node with high betweenness is likely to be aware of what is going on in multiple social circles. The important thing to know is that betweenness is a measure of how important the node is to the flow of information through a network. The computation of this is quite complex, but every network analysis software tool will compute it for you. Technically, it measures the percentage of shortest paths that must go through the specific node. This is what betweenness centrality captures. Thus, Bob is very important to the flow of information through this network. All information passing to and from those notes on the left must go through Bob if it is going to reach anyone else. He is the critical mode that allows information to pass from the cluster on the right to all the individual people he knows that were shown on the left. Jennifer Golbeck, in Introduction to Social Media Investigation, 2015 Betweenness Centralityīetweenness centrality is a widely used measure that captures a person's role in allowing information to pass from one part of the network to the other.įor example, consider Bob in Figure 21.5 (A).
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