Jeffrey Heer is a familiar name for people from info-visualization community. The Prefuse visualization toolkit created by Jeffery is used and referred by almost all infographics enthusiasts. But somehow I missed out his wonderful (almost an hour long) lecture at University of Washington, Voyagers and Voyeurs: Supporting Collaborative Information Visualization.
Apart from the awesome demos of his works on interactive visualizations, in this lecture, Jeffrey also talks about how collaborative annotations and discussions can enhance the effectiveness of an info-visual. According to him, if a large enough, interesting and interactive info-visual is made available to general audience, equipped with integrated annotation and commenting tools, individuals (not only experts) can find out amazing patterns and perspectives.
From the excerpt:
Interactive visualizations leverage human visual processing and cognition to increase the scale of information with which we can effectively work. However, most visualization research to date focuses on a single-user model, overlooking the social nature of visual media. Visualizations are used not only to explore and analyze, but to communicate findings. People may disagree on how to interpret data and contribute contextual knowledge that deepens understanding. Furthermore, some data sets are so large that thorough exploration by a single person is unlikely. Jeffrey Heer from the University of California, Berkeley, presents a number of novel visualization techniques in this University of Washington Computer Science and Engineering program.