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Fig. 1. Social Networking Site Use for Internet Users by Age Group, 2005-2013. From “Social Networking Fact Sheet.” Internet Project Library Survey, Pew Research Center, www.pewinternet.org/data-trend/social-media/social-media-use-by-age-group/. Accessed 14 Oct. 2015.
“Social Media Use by Age Group Over Time,” Pew Research Center, Washington, DC (January, 2014) http://www.pewinternet.org/data-trend/sociaI-media/sociaI-media-use-by-age-group/.