"Best practices for agencies to counter misinformation, rumors and false information are detailed and categorized in this white paper, and challenges and additional considerations are presented for review. This report illustrates methods of countering false information on social media with case studies: The 2014 South Napa earthquake: Tweets were filtered by geolocation to eliminate posts from trolls; The 2016 Louisiana floods: The Red Cross published and shared a blog to counter rumors and misinformation about food distribution and shelter policies; The 2017 Oroville Dam evacuation: An accidentally misleading tweet suggested the evacuation area included all of Sacramento County. Local agencies used traditional and social media to provide correct information. Examples of best practices include: Establishing partnerships with local traditional media outlets before disasters, so means exist to disseminate accurate information; Using the Joint Information System to coordinate public information efforts of multiple jurisdictions and agencies; and Setting up a central website to debunk bad information." (Executive summary)