@conference { WWS12, title = {Topic Tracker: Shape-based Visualization for Trend and Sentiment Tracking in Twitter}, booktitle = {Published at the 2nd IEEE Workshop on Interactive Visual Text Analytics "Task-Driven Analysis of Social Media" as part of the IEEE VisWeek 2012, October 15th, 2012, Seattle, Washington, USA}, year = {2012}, author = {Wanner, Franz and Weiler, Andreas and Schreck, Tobias} }