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NOTE: Worst Offenders for WordPress 2.5 is currently a pre-alpha release for developer feedback only.
If you use any anti-spam tool you will no doubt be delighted that spam can be automatically identified, but less happy that you now have to either trawl through the spam to check for false positives, or just give up and hope for the best – this is where Worst Offenders can help: it analyses messages already marked as spam and uses several techniques to identify messages with common sources, subjects and content – those which are definitely spam. These Worst Offenders can be deleted en-masse, hopefully leaving just a handful of messages that can be checked by hand.
<h3>To do</h3>
Switch to using wp_cache wherever options were used 
Improve count function to remove duplicates

Worst Offenders

NOTE: Worst Offenders for Wordpress 2.5 is currently a pre-alpha release for developer feedback only.

Pippin Williamson

Modifies the Empty Spam action in WordPress to process the spam deletion in batches, allowing you to delete thousands or even hundreds of thousands of spam comments at once without killing your server.
Have you found a bug or have a suggestion or improvement you’d like to submit? This plugin is available on <a href="https://github.com/pippinsplugins/batch-comment-spam-deletion" rel="nofollow ugc">Github</a> and pull requests are welcome!

Batch Comment Spam Deletion

Modifies the Empty Spam action in WordPress to process the spam deletion in batches instead of all at once.

Worst Offenders vs Batch Comment Spam Deletion