A black forum is a closed forum that only members have access to. I had to get permission to share this, and even then I was subject to restrictions thus the paraphrasing. One of the obvious restrictions is not sharing the original posters name. This is for the security reasons, and even had the original poster not requested it. I sure as hell would have not included it regardless.
I doubt it is viral, because once again this is a black forum. That frustrates dissemination of said information. For the obvious reason that nobody can link the source, and that all of a hundred members at most will see the information. About the only place worse to spread a viral marketing strategy would be through a completely dead forum. Ideally you would want to use a public active forum after you spent a few weeks working up a reputation.