We audited the Department of Homeland Security’s (DHS) efforts to implement Web 2.0 technology, also known as social media. The objective of our audit was to determine the effectiveness of DHS’ and its components’ use of Web 2.0 technologies to facilitate information sharing and enhance mission operations. The scope and methodology of this audit are discussed further in appendix A. Although DHS prohibits social media access to employees using a government-issued electronic device or computer unless a waiver or exception is granted, the Department has steadily increased its use of various social media sites over the past 5 years.