Pablo Barberá, Assistant Professor, School of International Relations, University
of Southern California,
pbarbera@
123456usc.edu
. Andreu Casas, Moore-Sloan Research Fellow, Center for Data Science, New York University,
andreucasas@
123456nyu.edu
. Jonathan Nagler, Professor, Wilf Family Department of Politics, New York University,
jonathan.nagler@
123456nyu.edu
. Patrick J.Egan, Associate Professor, Wilf Family Department of Politics, New York
University,
patrick.egan@
123456nyu.edu
. Richard Bonneau, Professor, Center For Genomics and Systems Biology, Courant Institute
of Mathematical Sciences, Computer Science Department, and Center for Data Science,
New York University; and Flatiron Institute, Center for Computational Biology, Simons
Foundation,
bonneau@
123456nyu.edu
. John T. Jost, Professor, Department of Psychology, New York University,
john.jost@
123456nyu.edu
. Joshua A. Tucker, Professor, Wilf Family Department of Politics, New York University,
joshua.tucker@
123456nyu.edu
.
We thank Nick Beauchamp, Ken Benoit, Drew Dimmery, Andrew Eggers, Thorsten Faas, Michael
Lewis-Beck, Jennifer Pan, Paul Quirk, Molly Roberts, Annelise Russell, Gaurav Sood,
David Sontag, Dustin Tingley, and John Wilkerson for their helpful comments and suggestions
to previous versions of this paper. We also gratefully acknowledge financial support
for the NYU Social Media and Political Participation (SMaPP) lab from the INSPIRE
program of the National Science Foundation (Award #1248077), the Bill and Melinda
Gates Foundation, the William and Flora Hewlett Foundation, the Rita Allen Foundation,
the John S. and James L. Knight Foundation, and Intel. In addition, we would like
to thank the Gordon and Betty Moore Foundation and the Alfred P. Sloan Foundation
for their support of the Moore Sloan Data Science Environment, which funded Casas’
time on the project. Replication files are available at the American Political Science
Review Dataverse:
https://doi.org/10.7910/DVN/AA96D2