This paper was cited by Curtis 2014 in the D-F "mentions" category, about the usefulness of internet sites for outreach in HIV awareness.
BUT, I can't find a mention of Drugs-forum specifically. The methods page states: "The second group, the “Internet” sample, was composed of men recruited solely on the Internet using primarily banner ads placed on the home page of Gay.com."
I include this study from 2004 to remind everyone that though gay.com is a cesspool now, men from North Dakota once found love there, and a survey.
But really, maybe there's a supplement I missed.
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Using the Internet to Recruit Rural MSM for HIV Risk Assessment: Sampling Issues
D-F is in there, seeking Men.