There's no museum of online activism; its history is told as a series of disconnected events. Without perspective, we are left to guess what will work next, while scrambling to recreate elements of earlier successes. What can we learn from two decades of online protests? What has made these campaigns work where so many others have failed? And how can the bloggers, activists, and others at re:publica take these lessons and apply them to the wild web of today—and tomorrow?