There have been incidents of Wiki spam and other abuse.
If you wish to draw the admins' attention to abuse on the Wiki, you should tag pages for deletion by editing the page and adding the "delete" tag:
Abusive users can be tagged on their user pages using the "ban" tag:
These do not actually perform the action of deletion or banning; they merely mark the pages as candidates for review.
Saoshyant has indicated that he is the primary admin contact for abuse issues.