Hubs

Find the nodes carrying far more connections than anyone else, then ask what happens if one goes quiet. Unlike a bridge, which joins two separate clusters, a hub sits inside a cluster and routes most of its traffic, so it concentrates both influence and risk.

Find the nodes carrying far more connections than anyone else, then ask what happens if one goes quiet. Unlike a bridge, which joins two separate clusters, a hub sits inside a cluster and routes most of its traffic, so it concentrates both influence and risk.

Example

In the friend-group sketch, Priya has 11 of the 14 "invites" edges. Nobody plans anything she didn't start. That makes her the hub: when she got a demanding new job, the group stopped meeting, and the fix was getting two other people hosting.