How often do you moderate your comments on the blogs?
I do it more than 5 times a day and sometimes more than that. If you are running a blog on WordPress Platform then there is all good chance that your blog has been a target of a Spammer. So if you are going through such a phase then feel free to use the following word list in your WordPress dashboard’s Comment Blacklist Section.
This is the path to get to that screen: WordPress Dashboard -> Settings -> Discussion -> Scroll Down a little -> Comment Blacklist Empty Box -> Copy/Paste the following into it:
Download WordPress Comment Blacklist
Hope you find this post useful 
In case if you are victim of Plagiarism then you can check out this post: Easy Solution For Plagiarism
Source for the WordPress Comment Blacklist: Prelovac
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Hey, this is Kamal and I operate the NPXP network of websites. I am a blogger as well as a freelancer.
Spam it’s the only thing that many so called link builders use to have fast links. Though the link they get, most of the time is not being index by Google, or simply is deleted by the adim owner.
Since there are so many people posting spam comments everywhere, it would be a very difficult job for blog owners to maintain their blogs. This fact is proven even if they install useful anti-spam plugins in their sites.