Here are some WordPress plugins that can help you eliminate spam.

Akismet - Antispam plugin from the creators of Wordpress that uses a central database of spam comments to flag spam. Requires a free API key from Wordpress.com

Spam Karma - Analyzes comments for spam based on a karma system.

Bad Behavior - Prevents spambots from even accessing your site by analyzing their HTTP requests.

Did You Pass Math? - Asks commenters a simple math question before their comments are posted.

Comment Timeout - Closes comments on old posts.

Good look…!

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