The United Nations (UN) actively incorporated new media as a tool for consultation and agenda setting during the Millennium Development Goal (MDG)–Sustainable Development Goal (SDG) transition. As global actors shifted their attention to the sustainable development goals, the UN and its partners scaled up their digital engagement with civil society, multinational agencies, and country-level stakeholders to inform the post-2015 agenda. This chapter explored how the UN integrated Twitter into the post-2015 consultation and how the UN Women and the United Nations Girls’ Education Initiative used Twitter to construct and diffuse girls’ education policy discourse during the MDG–SDG transition.