This has been discussed before and the link I provide will lead you to several others on the subject http://wordpress.com/forums/topic.php?id=6258&replies=4#post-40328
You can choose to moderate your posts and then you will not be surprised by any comments that are posted as you get to see them and choose whether or not to approve them first. You can also develop an comment “blacklist” on your Discussion page as an alternative to comment moderation. -> Dashboard -> Options -> Discussion
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