1. Teens, social media & technology;Lenhart,2015
2. Englander EK. Research Findings: MARC 2011 Survey Grades 3–12. MARC Research Reports. 2011. Available at: http://vc.bridgew.edu/marc_reports/2/. Accessed May 29, 2016.
3. Nielsen LH. SMS Text Messaging Tops Mobile Phone Calling; 2008. Available at: http://www.nielsen.com/us/en/insights/news/2008/in-us-text-messaging-tops-mobile-phone-calling.html. Accessed May 23, 2016.
4. The smartphone difference;Smith,2015
5. Most U.S. smartphone owners check phones at least hourly;Newport,2015