This document outlines 10 lessons learned about public communications from the perspective of international humanitarian organizations and NGOs. It discusses how text messages provided key information during disasters when voice networks were down. It also emphasizes the importance of leveraging crowdsourced information from social media and the public, who can often provide more real-time situational updates than agencies. Finally, it encourages identifying plans to collaborate with volunteer groups to amplify messaging and monitor crowdsourced data and discussions.