This essay addresses an even darker side to social media: its use for manipulation on scales both small and large and its direct and indirect ties to violence. Increasingly, social media is used as a tool to foment violence, particularly in regions of the world where access to the Internet is otherwise limited. Even when a social media site is not itself an instrument to foment violence, it may have the effect of encouraging and validating the extreme views that result in violence. What is the role of social media sites in containing their use for such nefarious purposes, and how should the law govern them? Should such sites be liable for failing to take down misleading or inaccurate content or for allowing hate speech? If not, what are other options for controlling its misuse?