This volume provides a critical view of the nature and quality of political and civic communication on Twitter. The introduction lays out the current state of research, showing the continuum of views, from the more optimistic to more pessimistic, regarding the platform's potential to facilitate civic conversations. The eleven empirical case studies in the book provide new insights, addressing a variety of topics through a diverse array of methodological approaches. Together, the chapters provide a counter position to recent studies that offer more celebratory assessments of Twitter's potential. The book draws attention to the chaotic, insular, uncivil, and emotionally charged nature of debate and communication on Twitter.