Not quite Wilf,

A network system that is tightly coupled like a hiearchy, political hegemony, or military social network if you attack the connectors then the nodes will faill. Imagine cutting command and control and you get the idea.

If the network is loosely coupled the network connections may be loosely coupled and the nodes themselves are the point to attack. In cell networks the coupling may be one direction and one to many. Cutting the network connections will have little effect.

In loosely coupled social networks (especially) the nodes may not all be of the same importance and they can be disturbed or placed into an instable state by interupting critical points. This is true if there is a primary ideological focus, it is very true if there is a financial or social capital focus, and in the case of social movements thought leaders can become the critical locus.