arXiv:1710.10295v1 [physics.soc-ph] 27 Oct 2017 1 Rhetorically-Induced Group Polarization in Small Opinion Networks Michael Gabbay, 1 ∗ Zane Kelly, 1 Justin Reedy, 2 John Gastil 3 $^{∗}$To whom correspondence should be addressed: gabbay@uw.edu. $^{1}$Applied Physics Laboratory, University of Washington, Seattle, WA 98105, USA $^{2}$Dept. of Communication and Center for Risk & Crisis Management, University of Oklahoma, Norman, OK 73019, USA $^{3}$Depts. of Communication Arts & Sciences and Political Science, Pennsylvania State University, University Park, PA 16802, USA