1. European Commission: Commission proposes a comprehensive reform of the data protection rules,
http://ec.europa.eu/justice/newsroom/data-protection/news/120125_en.htm
(accessed January 2014)
2. Microsoft: Microsoft to Acquire Yammer,
http://www.microsoft.com/en-us/news/press/2012/jun12/06-25msyammerpr.aspx
(accessed January 2014)
3. Ho, R.: Google+ is now available for Google Apps,
http://googleenterprise.blogspot.it/2011/10/google-is-now-available-with-google.html
(accessed January 2014)
4. Hinchcliffe, D.: Today’s Collaboration Platforms for Large Enterprises,
http://www.zdnet.com/the-major-enterprise-collaboration-platforms-and-their-mobile-clients-7000018519/
(accessed January 2014)
5. Narayanan, A., Toubiana, V., Barocas, S., Nissenbaum, H., Boneh, D.: A critical look at decentralized personal data architectures. CoRR abs/1202.4503 (2012)