1. Annenberg School for Communication, University of Pennsylvania, Philadelphia, PA 19104, USA
2. Social Data Collaboratory, NORC-University of Chicago, Chicago, IL 60637, USA
3. Department of Health Behavior, Society and Policy, Rutgers University School of Public Health, Piscataway, NJ 08854, USA
4. Department of Communication, Cornell University, Ithaca, NY 14850, USA
5. Fors Marsh Group, Arlington, VA 22201, USA
6. Department of Media and Communication, Konkuk University, Seoul, South Korea
7. Department of Communication, Villanova University, Villanova, PA 19085. USA
8. Department of Communication Studies, University of Georgia, Athens, GA 30602, USA
9. Tobacco Control Research Branch, National Cancer Institute, Bethesda, MD 20814, USA
10. School of Information, University of California, Berkeley. Berkeley, CA 94704, USA
11. Department of Communication Studies, Texas Christian University, Fort Worth, TX 76129, USA
12. Department of Medical Ethics and Health Policy, Perelman School of Medicine, University of Pennsylvania, Pennsylvania, PA 19104, USA