Here’s an official video from Google discussing comment spam and forum spam.

If you own a WordPress site, you know there are bots designed to post fake comments on your site.


Because if you do, Google will penalize your sites.

Make sure you use a plugin such as Akismet to stop comment spam.

If you run a forum, make sure you use a special captcha that can not be cracked by Spam programs such as UNO or SE Nuke.