1. Statista20172017-09-16Percentage of U.S. population with a social media profile from 2008 to 2017 https://www.statista.com/statistics/273476/percentage-of-us-population-with-a-social-network-profile/
2. Statista20162017-09-01Number of social network users in China from 2014 to 2021 (in millions) https://www.statista.com/statistics/277586/number-of-social-network-users-in-china/
3. SMA20172017-09-01Social media & Health care by the numbers https://sma.org/social-media-healthcare-by-the-numbers/
4. Beckersspine20162017-09-0110 things to know about social media in healthcare: Who's using it? Does it make a difference? http://www.beckersspine.com/orthopedic-spine-practices-improving-profits/item/29986-10-things-to-know-about-social-media-in-healthcare-who-s-using-it-does-it-make-a-difference.html