A. Snapshot and . Facebook, Online: http://www.facebook.com (accessed in 01, 2010.

J. Domingo-ferrer and J. Mateo-sanz, Practical data-oriented microaggregation for statistical disclosure control, IEEE Transactions on Knowledge and Data Engineering, vol.14, issue.1, pp.189-201, 2002.
DOI : 10.1109/69.979982

K. L. Huang, S. S. Kanhere, and W. Hu, Preserving privacy in participatory sensing systems, Computer Communications, vol.33, issue.11, pp.1266-1280, 2010.
DOI : 10.1016/j.comcom.2009.08.012

J. Joshi, E. Bertino, U. Latif, and A. Ghafoor, A generalized temporal role-based access control model, IEEE Transactions on Knowledge and Data Engineering, vol.17, issue.1, pp.4-23, 2005.
DOI : 10.1109/TKDE.2005.1

D. Kulkarni and A. Tripathi, Context-aware role-based access control in pervasive computing systems, Proceedings of the 13th ACM symposium on Access control models and technologies , SACMAT '08, pp.113-122, 2008.
DOI : 10.1145/1377836.1377854
URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.157.7811

D. Leung, Introducing Geofences on Flickr! Online: http://blog.flickr.net (accessed in 01, 2012.

W. Luo and U. Hengartner, Proving your location without giving up your privacy, Proceedings of the Eleventh Workshop on Mobile Computing Systems & Applications, HotMobile '10, pp.7-12, 2010.
DOI : 10.1145/1734583.1734586
URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.187.3410

L. Sweeney, k-ANONYMITY: A MODEL FOR PROTECTING PRIVACY, International Journal of Uncertainty, Fuzziness and Knowledge-Based Systems, vol.2, issue.3, pp.557-570, 2002.
DOI : 10.1109/RISP.1993.287632

B. Upbin, Color, a Twitter for Photo and Video, Launches with $41 Million Online: http://www, forbes.com