Idea: Collaborative spam recognizing service for Drupal

If you administer a Drupal site (or any other site that allows anonymous posts or comments) you will have to find ways to contend with spam posts. The auto-generated, link-filled kind of comment spam messages are especially annoying when you're trying to open up your site to comments from he community, since they can discourage people from reading and commenting.

If someone was skilled and creative enough, they could build a Drupal module that would allow administrators to flag comment spam like this and have it sent directly to a central web site. This collaborative "dead comment pool" service would parse the spam for foul links, then keep a list of spam websites. It could tally how many Drupal admins considered each site a problem.

After some time submitting spam, the Drupal Admin could turn on automatic comment filtering for their site. The filter could then consult the central site and start blocking spam comments. Filters could be adjustable. For instance, you might not want to automatically delete a comment unless there were 20 other administrators who had marked the site as spam, or you may want to just flag comments as spam and not have them deleted.

I know there are several useful spam-killing modules available for Drupal already, but something like this might be helpful too.