Well, that was fun. I had a look at this a few months after setting it up with relatively open controls for the sake of education, and it looks like it had gained a nasty spam infection. While I don't mind hosting nonsense, I guess it's my duty as a responsible individual to not provide a free service for black-hat SEOs to spam links all over the place. Lesson learned, I guess.
If I get around to it, I might re-instate the wiki with some captcha plugins or something to see if that resolves anything at some point in the future. It would be inadvisable to hold your breath.