1. Harvard Business Review Staff. How people really use mobile;Harv Bus Rev,2013
2. Social networks, social media, and innovating surgical education;Vohra;JAMA Surg,2015
3. The Nielsen Company. So many apps, so much more time for entertainment. Available at: http://www.nielsen.com/us/en/insights/news/2015/so-many-apps-so-much-more-time-for-entertainment.html. Accessed June 29, 2015.
4. The social economy: unlocking value and productivity through social technologies;Chui,2012
5. Goldman D. Facebook tops 900 million users. Available at: http://money.cnn.com/2012/04/23/technology/facebook-q1/. Accessed June 29, 2015.