It seems that no Captcha plugins are work for P2 on my site, I have tried:
- Conditional CAPTCHA for WordPress: Did not show up for comments with
viagra-test-123in username field.
- Captcha: Can not be verified, although the input is right
- reCAPTCHA: Can not be verified, although the input is right
I suspect that it is due to some scheme of P2 that make all the Captcha plugins filed to work.
Did I need to have a Captcha plugin? Which one is recommend?