In this report from the United States Institute of Peace’s Centers of Innovation for Science, Technology, and Peacebuilding, and Media, Conflict, and Peacebuilding, a team of scholars from George Washington University and American University analyze the role of social media in the Arab Spring protests of 2011–12. It builds on a previous report, published in 2010 by USIP Press, titled Blogs and Bullets: New Media in Contentious Politics, and applies its five-level framework for studying and understanding the role of new media in political movements. The authors utilize a unique dataset from bit.ly, the URL shortener commonly associated with Twitter and used by other digital media such as Facebook. With these data, the authors are able to test empirically the claims of “cyberoptimists” and “cyberskeptics” about the role of new media in bringing down autocratic regimes in Tunisia, Egypt, and Libya and in spurring protests in other parts of the Arab World, such as Bahrain.