The impact of social media on the media environment has been widely recognized; as has the ability of extremist and adversarial organizations to exploit social media to publicize their cause, spread their propaganda, and recruit vulnerable individuals. Supporting the growth of social media has been the phenomenal global increase in mobile telephone usage, and much of this increase is in areas where there are existing conflicts or conflicts are highly likely. These combined revolutions will increasingly have a direct impact on virtually all aspects of military operations in the 21st century. In doing so, social media will force significant changes to policy, doctrine, and force structures. This Letort Paper explores the implications of social media for the U.S. Army.