Can you block certain people from commenting posts?

03/05/2011 21:15Posted by Randgor

Do not allow the corruption to fester and spread throughout the community. You too, can find salvation through the ignore function if you so wish.

The ignore function is indeed a good way to avoid posters that you do not like.

The only people who will be blocked from posting are those who seem incapable of respecting the forum guidelines:
http://eu.battle.net/wow/en/forum/topic/816711831

Also, don't be afraid to use the forum rating feature:
http://eu.battle.net/wow/en/blog/930468