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Author notes

This paper draws upon the work of the OpenNet Initiative (ONI), a four university consortium which joins the Universities of Cambridge, Harvard, Oxford, and Toronto, and with which the authors are affiliated. Prof. Palfrey is one of the principal investigators of the ONI, along with Prof. Ron Deibert at the Citizen Lab at the University of Toronto, Prof. Jonathan Zittrain of the Oxford Internet Institute, and Rafal Rohozinski of the University of Cambridge. The authors of this paper are grateful for the collaboration of their colleagues and are alone responsible for all errors and omissions.

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