This Wordpress Plugin uses Machine Learning to detect spam and adult content comments and mark them as spam. Additionally it allows you to filter negative comments and keep them pending for approval.
It uses the Datumbox API 1.0v and is compatible with Wordpress 3.6v or higher.
To read more about how it works, how it should be configured etc check out the original blog post: http://blog.datumbox.com/how-to-build-an-intelligent-antispam-wordpress-plugin/
Datumbox Website: http://www.datumbox.com/
Download API Documentation and Code Samples: http://www.datumbox.com/machine-learning-api/
Sign-up for free API Key: http://www.datumbox.com/users/register/
View your API Key: http://www.datumbox.com/apikeys/view/