Short Answer: divide it.
It's long been my contention that Iraq was stabilized at an acceptable level of controlled chaos due to a happy accident by al Qaeda (in an attempt to expand/lead the loose insurgency in a new direction). What did they do? They blew up the Golden Mosque in Samara in 2006. This act of symbolic terrorism did indeed disrupt social networks as anticipated, however the consequences were ultimately disastrous for the Iraqi open source insurgency.
The reason for this is it broke the dynamics of the open source insurgency in ways the US and Iraqi government's COIN efforts could not. First, it created a permanent split between Sunni and Shiite insurgent groups/militias. Coopetition ended. Second, it motivated large Shiite militias to start an ethnic cleansing of Sunni areas. This put acute pressure on Sunni guerrilla groups who were too small (by design to avoid US counter-pressure) to defend themselves against large militias operating in the open. The result was an opening, very close to the one I described in my 2005 NYTimes OpEd, that allowed the US to convert Sunni guerrilla groups into militias that were not loyal to the central government (in direct contradiction to its COIN manual).
It's a nice example of the dynamics of many to many conflict, social network disruption, and the development open source counterinsurgency.
See this excellent description at the blog, "Musings on Iraq" for more detail on the ethnic cleansing operations. It also includes this money quote: "the majority of the Sunni insurgency gave up and switched sides to align with the Americans rather than face annihilation at the hands of the Shiite militias, Al Qaeda in Iraq, or the United States."
NOTE: it's pretty clear from the above that social network disruption (either through attacks on symbolic targets or blood and guts terrorism) is like playing horseshoes with live hand grenades. It's ultimately a losing strategy for advancing an open source insurgency. Social network disruption is very likely to break standing order 6: don't fork the insurgency.