In recent years, activists in global social movements such as #BlackLivesMatter, #MeToo, and #BringBackOurGirls have harnessed social media to raise awareness of injustice and counter prevailing narratives. How has Twitter reshaped activism and to what extent has the platform empowered marginalized groups to achieve political victories? Brooke Foucault Welles, associate professor at Northeastern University and coauthor of the book #HashtagActivism: Networks of Race and Gender Justice, and Meighan Stone, adjunct senior fellow at the Council on Foreign Relations and coauthor of the book Awakening: #MeToo and the Global Fight for Women's Rights, to discuss the role of Twitter in modern social justice movements in the United States and abroad, including the implications for race and gender equality.