Doors not to open

Extending my knowledge on SEO I was getting acquainted with some FireFox plugins (SEO for Firefox, yExplore, and SEOpen) when I happened upon the related search. Specifically, I did a related:http://plind.dk/ search on Google. The result? Hit #9 is 'Suicide: Read This First' and #10 is 'I had sex with my brother but I don't feel guilty'. I'm not quite sure I understand this ...

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