Google's recaptcha

What is recaptcha and how/will it help prevent spam ?

For answers to those questions you can look at google's page about recaptcha (https://google.com/recaptcha)

Installation

This installation guide requires drupal 6,7 or preferably 8 (or higher). Note this installation requires captcha and recaptcha, these are different plugins and not a type error.

    • Extract the archives into sites/all/modules/[recaptcha/captcha]respectively and relative to your own drupal installation (this folder may need to be created manually)
  • Now navigate to your drupal administration page in your browser (/admin/modules)
    • Search for captcha and enable it
    • Search for recaptcha and enable it
  • Once complete it is critical to configure your captcha setting in the web interface (/admin/config/people/captcha) and do not forget to enable the captcha-points (/admin/config/people/captcha/captcha-points).