1. Facebook Advertisements for Inexpensive Participant Recruitment Among Women in Early Pregnancy
2. Willingness to Participate in Research during Pregnancy
3. PerrinADugganM2016-12-12Americans' Internet Access: 2000-2015. 2015 Jun 26. Pew Research Center.
http://www.pewinternet.org/2015/06/26/americans-internet-access-2000-2015/#internet-usage-by-age
4. Alexa2016-08-31How popular is facebook.com?
http://www.alexa.com/siteinfo/facebook.com
5. Facebook as a Recruitment Tool for Adolescent Health Research: A Systematic Review