This paper is in the following e-collection/theme issue:

Medicine 2.0: Social Media, Open, Participatory, Collaborative Medicine 

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Works citing "Effects of Internet Popular Opinion Leaders (iPOL) Among Internet-Using Men Who Have Sex With Men"

Nai-Ying Ko, Chao-Hsien Hsieh, Ming-Chi Wang, Chiang Lee, Chun-Lin Chen, An-Chun Chung, Su-Ting Hsu
J Med Internet Res 2013 (Feb 25); 15(2):e40 

According to Crossref, the following articles are citing this article (DOI 10.2196/jmir.2264):

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

1. Martinez O, Wu E, Shultz AZ, Capote J, López Rios J, Sandfort T, Manusov J, Ovejero H, Carballo-Dieguez A, Chavez Baray S, Moya E, López Matos J, DelaCruz JJ, Remien RH, Rhodes SD. Still a Hard-to-Reach Population? Using Social Media to Recruit Latino Gay Couples for an HIV Intervention Adaptation Study. Journal of Medical Internet Research 2014;16(4):e113 [CrossRef]
2. Curtis BL. Social Networking and Online Recruiting for HIV Research. Journal of Empirical Research on Human Research Ethics: An International Journal 2014;9(1):58 [CrossRef]
3. Schnall R, Travers J, Rojas M, Carballo-Diéguez A. eHealth Interventions for HIV Prevention in High-Risk Men Who Have Sex With Men: A Systematic Review. Journal of Medical Internet Research 2014;16(5):e134 [CrossRef]