 2009 , Groves 2011 , Howison, Wiggins, and Crowston 2011 , boyd and Crawford 2012 , Taylor 2013 , Mayer-Schönberger and Cukier 2013 , Golder and Macy 2014 , Ruths and Pfeffer 2014 , Tufekci 2014 , Sampson and Small 2015 , Lewis 2015 , Lazer 2015 , Horton and Tambe 2015 , Japec et al. 