This paper is in the following e-collections/theme issues:

Internet-based Survey & Research Methodology  Research Participants Recruitment and Engagement 

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Works citing "Estimation of Geographic Variation in Human Papillomavirus Vaccine Uptake in Men and Women: An Online Survey Using Facebook Recruitment"

Erik J Nelson, John Hughes, J Michael Oakes, James S Pankow, Shalini L Kulasingam
J Med Internet Res 2014 (Sep 01); 16(9):e198 

According to Crossref, the following articles are citing this article (DOI 10.2196/jmir.3506):

(note that this is only a small subset of citations)

1. Nelson EJ, Hughes J, Oakes JM, Thyagarajan B, Pankow JS, Kulasingam SL. Human Papillomavirus Infection in Women Who Submit Self-collected Vaginal Swabs After Internet Recruitment. Journal of Community Health 2014; [CrossRef]