*  A catchphrase of my mother’s and a powerful adject for me.

 *  danah boyd, It’s Complicated: The Social Lives of Networked Teens (New Haven: Yale University Press, 2013), 21–22.

 *  Interview with the author.

 *  Sarita Yardi and danah boyd, “Dynamic Debates: An Analysis of Group Polarization over Time on Twitter,” Special issue on “Persistence and Change in Social Media,” in Bulletin of Science, Technology and Society 30(5), October 2010.

 † Ingmar Weber, Venkata Kiran Garimella, and Alaa Batayneg, “Secularist Versus Islamist Polarisation in Egypt on Twitter,” Qatar Computing Research Institute, 2013.

 *  Eytan Bakshy, “Rethinking Information Diversity in Networks,” Facebook.com, January 17, 2012.