Thank you to Rebecca, for wikidemia. This term is used to describe 'an academic work passed off as scholarly yet researched entirely on Wikipedia'. Brilliant, and another triumph for the Urban Dictionary, from which the definition comes.
In the meantime, I'm afraid, the term appears also to have been coined to describe something else. Wikipedia now uses the word wikidemia to refer to a project which is "a space for articles related to academic research about Wikipedia." In all, 42 people have signed up as members of this project since it began in December 2004, or about one a month. I suspect that the number of wikidemics, in the sense of the first definition above, massively outnumbers the genuinely academic 42 - although you can't tell who they are, because most use netonyms.