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Preventing spam in Wordpress
Actions to be carried out
Restrict comments to registered users only
Install an effective Captcha system (e.g. via a plugin)
Add an anti-spam plugin: Askimet / Anti-spam Bee / SI CAPTCHA Anti-Spam etc.
Set up the solution offered by Wordpress codex (click here)
Find out more via a Google search
More information/References
http://codex.wordpress.org/fr:FAQ_Combattre_les_Spams_de_Commentaires
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