Growing evidence suggests that households’ own social networks are critical sources of support during protracted crises. Yet governments, donors and aid agencies have, traditionally, not accounted for such informal support when assessing households’ vulnerability or their resilience, or when designing, implementing, and evaluating their programs. The humanitarian community must ensure that formal assistance strengthens, and at the very least does not undermine, these important sources of informal support. Support networks are also a critical but overlooked topic in global efforts to localize humanitarian assistance. But to date, localization has largely been framed in terms of engagement between formal actors, particularly between international and national NGOs, and discussions have large ..