wpDiscuz – Google reCAPTCHA
Finally you can use the new Google No CAPTCHA reCAPTCHA with wpDiscuz. This version of reCAPTCHA came as a result of quite obvious realization that bots got advanced enough to read CAPTCHA images better than most humans. So instead of making it harder for humans, there has to be a way to make this check easy for you, yet somewhat effective for keeping bots away. So and this is the best way, your commenters will be happy to pass the CAPTCHA with only one click on reCAPTCHA checkbox. This addon will increase your website comments, it’ll protect those from spam and abuse while letting real people pass through with ease.