1. The privacy jungle: On the market for data protection in social networks;Bonneau;Econ. Inf. Secur. Privacy,2010
2. Data theft: hackers attack;Fischetti;Sci. Am.,2011
3. W. Post, NSA slides explain the PRISM data-collection program, (June 6, 2013 http://wapo.st/J2gkLY. accessed 6.09.13).
4. D. Lewis, icloud data breach: Hacking and celebrity photos, (Sept. 2, 2014 http://onforb.es/1Cmngvl, accessed 6.10.14).
5. Persona: an online social network with user-defined privacy;Baden;SIGCOMM Comput. Commun. Rev.,2009