Prevent spam bot account

[pbuyle]

Despite Molom being actived on the site, we still have spam bot account.

A common pattern to detect spam bot is that they use the same value for all custom field.

Idea to explore

• When the Drupal.org username field is filled, check if the the username does exists (if doable)
• Add some custom validation: first and last names should be different, I doubt a real persom would have the same first and last name.

[pbuyle]

This could help http://befused.com/drupal/comment-spam