Smart Spam Filtering For Forums and Blogs?

phorm writes "While filtering for spam on email and other related mediums seems to be fairly productive, there is a growing issue with spam on forums, message-boards, blogs, and other such sites. In many cases, sites use prevention methods such as captchas or question-answer values to try and restrict input to human-only visitors. However, even with such safeguards — and especially with most forms of captcha being cracked fairly often these days — it seems that spammers are becoming an increasing nuisance in this regard. While searching for plugins or extensions to spamassassin etc I have had little luck finding anything not tied into the email framework. Google searches for PHP-based spam filtering tends to come up with mostly commercial and/or more email-related filters. Does anyone know of a good system for filtering spam in general messages? Preferably such a system would be FOSS, and something with a daemon component (accessible by port or socket) to offer quick response-times."

Comments

Mollom

[kbahey]

Mollom is free for low to medium traffic sites. They have plugins for the major CMSes out there (Drupal, Joomla, Wordpress, and a bunch of others).

It is relatively new, but I use it on several sites and it works well. See the score card for some fun.

The founder of Mollom is Dries Buytaert, the founder of Drupal, the CMS.