This paper addresses the issue of homegrown extremism in the United States. While the appeal of organizations such as Al Qaeda appears to be in general decline, analysts have detected in recent years an uptick in terrorism advocated and committed by US residents or citizens. This type of radicalization, the paper argues, is symptomatic of the increased psychological and social isolation of the digital age. After exploring this general theme, the analysis closes with a range of practical recommendations on how to identify and interdict homegrown terrorism in the United States.