It might be of interest to someone that pseudonymous Guardian writer "Erwin James", who wrote articles on prison life while serving a term, was outed using Wikipedia. He was released in 2004, and had chosen to remain pseudonymous. Published in today's Guardian, he an article formally revealing his identity[1]. It seems that users at a discussion board (at least, it is suggested on the board that some users made these edits) [2] had identified him using newspaper archives, and had outed him on his Wikipedia article[3]. It appears the discussion board users did not want to reveal his identity there initially, and had used Wikipedia to out him. The revisions were rightly removed from the article (and from article history) because they constituted original research. Following this identification, he has written this piece in the Guardian, formally identifying himself.
I thought this might be of interest regarding the real world implications of biographies of living persons and the community's response to original research and possible defamation. In this case, the discussion board users would have used another outlet, if not Wikipedia. We just happened to have been the obvious choice for them as a third-party, editable medium. Administrators here responded quickly and effectively to possible defamation, since relating 20 year-old newspaper articles to a pseudonym constitutes original research. Specifically, the first edit revealing his identity was reverted after 30 minutes, and a second edit revealing his identity was reverted after 20 minutes. Both of these revisions were deleted from article history. It is interesting to read a discussion of the BLP policy at the discussion board, and the user's impression of what it means.
Just to be clear, Wikipedia was only incidentally used to out him, and Wikipedia was not mentioned in Erwin James' article. He was identified on the message board later in the day, after the revisions were deleted. Erwin James comments, "The fallout from my identification on that message board, and the lies I told, has led to this piece; to me feeling that I now have to be completely honest about both my time in the legion and to stop hiding from who I really am."
[1] http://www.guardian.co.uk/society/2009/apr/24/erwin-james-journalism [2] http://www.ilxor.com/ILX/ThreadSelectedControllerServlet?action=showall&... [3] http://en.wikipedia.org/wiki/Erwin_James