In the Inter-Agency Standing Committee (IASC) formal commitments to Accountability to Affected Populations (CAAPs) it was acknowledged that “communication with, and inclusion of, crisis-affected populations in the design and provision of humanitarian assistance are integral parts of achieving strengthened accountability to affected populations.” The case of UNICEF Sierra Leone’s response to the flooding and mudslide of August 2017 is a clear example of how the social messaging platform U-Report can be a powerful tool to keep the voice of community members at the heart of the design, implementation and course correction of humanitarian response programmes, and can enhance the broader C4D strategies to address the needs of and engage affected populations.