Between May and August 2016, Facebook and the data consultancy ActionSprout conducted surveys of Brazilian Facebook users and analyzed their user-generated Zika-related content to better understand the public conversation. The two organizations evaluated the data to find out who was posting and sharing information about Zika and what they were sharing to determine what their concerns were. In total, the parties analyzed 17.3 million aggregated and anonymized interactions between May 5 and August 31, 2016, comprising 1.8 million posts, 13 million likes, 1.6 million comments and over 850,000 shares. This work allowed UNICEF Brazil to tailor their social media ads to create a bigger impact and increase engagement on Zika prevention practices.