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Pico_Train - 10:50 am on Sep 26, 2006 (gmt 0)
I ranked page 1 for a specific two word term for about a month. Then dissapeared - poof. I did some investigating and found about 30 "empty" blogs linking to my page with the specified two word term as the anchor text. I'm pretty darn sure that's the problem and that it was someone in that sector that did it to nail my site. Welcome to the real world. Competition is a b***h.
My opinion is that they can harm you.