The reCAPTCHA WordPress plugin uses a CAPTCHA to prevent comment spam and also uses MailHide to prevent email spam. Here is how to add reCAPTCHA to your WordPress blog:
1.Download the zip file..
2.Unzip the recaptcha folder into your WordPress wp-content/plugins directory.
3.Activate the plugin on the Options | Plugins Management page of your WordPress admin site. A web form will prompt you to enter a public and private API key. You can sign-up for the keys at the ReCAPTCHA site using the link provided, and then enter them in the text fields to activate the plugin.
4.That's it! Your reCAPTCHA widget should now appear on the comments page.
For more information on the plugin such as installation instructions for WordPress MU, visit the download link below.
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