That recommendation is based on some published case reports of suicide clusters, a phenomenon that has been recorded at least as far back as the Western record. The concern is directed more at repetitive, sensationalist reporting (their words). By comparison, I would say most of the comments on this thread are novel, considered, and skeptical. The more juvenile comments are identified and the posters are duly penalized. Of all the forums on the internet, the dynamics of this forum are probably most disposed toward good thinking coming out of a thread on suicide.

[edit]: a different view on suicide contagion: http://books.google.com/books?hl=en&lr=&id=lFklgI9qb...