Abstract
New information and communication technologies are impacting the humanitarian sector in profound ways. Both crisis-affected communities and global volunteer networks are becoming increasingly digital. This means that the former are increasingly the source of relevant crisis information, while the latter are becoming more adept at managing and visualizing this information on live crisis maps. This article introduces the field of crisis mapping and provides key examples from Haiti, Russia, Libya, and Somalia to demonstrate how digitally empowered affected communities and volunteer networks are reshaping humanitarian response in the twenty-first century.