For example - comments. I mean, REALLY ignore.How can I do this?The problem is that lots of people submit spammy comments, like:Hi cool article, visit site.comThen I get emails from the webmaster of site.com telling me to remove the comment because Google penalized his site because of unnatural linksI have captcha, also the system is set up to ignore comments with 3 or more links, but spam still goes through :(Can I make Google ignore comments completely, and not use them to rank sites and stuff?
Tell Google to ignore parts of website
seo;google
You should make sure that the comment links are equipped with the rel='nofollow' attribute. That way Google doesn't use them as ranking signals.You may also want to consider using some smart anti-spam system like Akismet that isn't vulnerable to manual or algorithmic decoding of captchas.Of course, you should clean up the existing spam comments as suggested by the previous answers.