From Bibliotheca Anonoma
Spam pages will have to be deleted or they'll become a mess. We might want to figure out some sort of basic captcha system to avoid the automated spam.
Users that created spam pages can be blocked. Notice that users can't be deleted normally, unless they have no edits, not even deleted edits.
Remove Unused Accounts
Frequently spam accounts will be made that have a deleted page or even have no page. Remove them as follows.