If you have had a blog for a while, you might have noticed that as it gets more popular with real users, it also gets more popular with spammers! Yes, there are evil lurking robots out there, who go around just adding their links to blogs.

There are some tools out there to get rid of this stuff, automagically!

Here are some useful methods:

For Drupal:
http://www.boldsource.com/tutorials/drupal-spam-protection-using-recaptcha
http://drupal.org/project/akismet

For Wordpress:
http://codex.wordpress.org/Combating_Comment_Spam

Others:
http://akismet.com/