1. Commission on Dental Accreditation Accreditation standards for dental education programs www.ada.org/sections/educationAndCareers/pdfs/predoc_2013.pdf
2. Commission on Dental Accreditation Accreditation standards for dental hygiene education programs www.ada.org/sections/educationAndCareers/pdfs/revised_dh.pdf
3. Social network sites: definition, history, and scholarship;Boyd;JCMC,2008
4. Lenhart A. Pew Internet project data memo Pew Internet and American Life Project www.pewinternet.org/~/media//Files/Reports/2009/PIP_Adult_social_networking_data_memo_FINAL.pdf.pdf
5. Facebook statistics http://newsroom.fb.com/content/default.aspx?NewsAreaId=22