1. Carnegie Mellon University, Tepper School of Business, Pittsburgh, PA 15213, USA.
2. Union College, Schenectady, NY 12308, USA.
3. Massachusetts Institute of Technology (MIT) Center for Collective Intelligence, Cambridge, MA 02142, USA.
4. MIT Media Lab, Cambridge, MA 02139, USA.
5. MIT Sloan School of Management, Cambridge, MA 02142, USA.