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I suspect a lot of comments are due to people thinking that leaving a comment and link to their photoblog will drive up their Google pagerank (and I hold hands up here as one guilty of this).
Actually, because the URLs (for Pixelpost comments, as for Blogger, Wordpress etc.) include the "rel=nofollow" attribute, crawlers don't pick them up as reciprocal links. I wonder whether, if this secret was exposed, you would discover your flood of comments dropping off?
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