1. John E. Walker Department of Economics, Clemson University , Clemson, SC 29634 , USA
2. Media Forensics Hub, Clemson University , Clemson, SC 29634 , USA
3. Andlinger Center for Energy and the Environment, Princeton University , Princeton, NJ 08540 , USA
4. Department of Communication, University of Oklahoma , Norman, OK 73019 , USA
5. Department of Communication, Clemson University , Clemson, SC 29634 , USA