Approved for public release; distribution is unlimited / On January 12, 2010, a 7.0 magnitude earthquake occurred 16 miles west of the Haitian capital of Port-au-Prince. The earthquake and ensuing destruction killed as many as 300,000 persons and displaced as many as 1.5 million more creating a humanitarian crisis and economic disaster of enormous scale. As the earthquake was in close proximity to the U.S. mainland, it was determined that three U.S. agencies would take leading roles: USAID would coordinate and lead the relief effort, the U.S. State Department would handle diplomatic issues and the Department of Defense (DoD) would take the lead on logistics and security issues. One social networking tool used by the DoD and relief organizations to share information and coordinate relief efforts was the All Partners Access Network (APAN). Communications between the various agencies were recorded and include chat logs, blogs and e-mails. A content analysis was conducted to develop insight into the way relief workers used APAN when responding during the Haiti humanitarian assistance / disaster relief (HA/DR) operation. Coding and analyzing the communication data collected during the relief effort provided insight into how individuals and organizations used APAN, a social networking tool, to collaborate during the disaster. Suggestions for improving APAN are discussed.