It is very important to use WangGuard at least for a week, reporting your site's unwanted users as sploggers from the Users panel.
WangGuard will learn at that time to protect your site from sploggers in a much more effective way.
WangGuard protects each web site in a personalized way using information provided by Administrators who report sploggers world-wide, that's why it's very important that you report your sploggers to WangGuard.
The longer you use WangGuard, the more effective it will become.
Upon user registration, WangGuard will check against a centralized database if the user is a Splogger or spam-user. If WangGuard determines that the user is a Splogger, WangGuard won't allow the registration on your site.