Vanessa Peña-Araya is a PhD student at the University of Chile, whose interests are Data Mining and Information Visualization. Mauricio Quezada is a PhD student at University of Chile, focusing on Data Mining, Information Retrieval and Social Media Analysis. Denis Parra is an Assistant Professor at the Department of Computer Science, in the School of Engineering at Pontificia Universidad Católica de Chile. His main research interests are Intelligent User Interfaces, Recommender Systems and Information Visualization. Barbara Poblete is an Assistant Professor at the Department of Computer Science of the University of Chile and Associate Researcher at the Center for Semantic Web Research (http://ciws.cl/).