L. Uden and A. Kumaresan, Usable Collaborative Email Requirements Using Activity Theory, pp.71-83, 2006.

R. B. Jennings, I. , E. M. Nahum, D. P. Olshefski, and D. Saha, A study of internet instant messaging and chat protocols, IEEE Network, vol.20, issue.4, pp.16-21, 2006.
DOI : 10.1109/MNET.2006.1668399

B. E. John, L. Bass, M. Sanchez-segura, and R. J. , Adams: Bringing Usability Concerns to the Design of Software Architecture, Proceedings of Engineering Human Computer Interaction and Interactive Systems Joint Working Conference ? EHCI- DSVIS 2004, 2004.

D. M. Boyd and N. B. Ellison, Social network sites: Definition, history, and scholarship, Journal of Computer Mediated Communications, vol.13, issue.1 11, 2007.
DOI : 10.1109/emr.2010.5559139

D. Fox and &. Naidu, Usability Evaluation of Three Social Networking Sites, 2009.

A. Dix and L. Cowen, HCI 2.0? Usability meets Web 2.0; Proceedings of HCI, 2007.

T. Nakayama, An Office Communications Model using CTstage4i; OKI Technical Review, 2003.

A. Mark, J. J. Parkulo, L. Mentel, C. H. Murray, and M. Willard, An Intra Office Email System in a Primary Care Practice: Implementation Challenges and Solutions, Annual Symposium Proceedings ? Vision of the Future and Lessons of the Past, 2001.