8. People’s motivation to contribute declines when they feel like they are not making a positive contribution. See Susan L. Bryant et al., “Becoming Wikipedian: Transformation of Participation in a Collaborative Online Encyclopedia,” Proc. 2005 Int’l ACM SIGGROUP Conf. on Supporting Group Work (2005), http://www.cc.gatech.edu/~asb/papers/bryant-forte-bruckman-group05.pdf; Panciera et al., supra note 59, at 55; Cosley, supra note 4, at 67.