This document discusses a study examining the use of social media, specifically Twitter and Facebook, by the CDC and WHO during the 2009 H1N1 flu pandemic. The study analyzed over 200 social media posts and official website messages from April to July 2009. It found that the WHO's social media posts more closely reflected the situation updates on its official website, while the CDC's posts varied in focus across platforms. Both organizations avoided direct engagement with users on social media. The study concludes that social media can effectively disseminate timely pandemic information while avoiding misinformation, but direct interaction with users may not be advisable in emergency situations.