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idoc - 2:47 pm on Dec 20, 2003 (gmt 0)
That it appears as a filter because it is new...I think the truth will hurt here but it is because most commercial sites are relatively shallow with depth of content as compared to the .org and .edu pages when you discount "kw1 kw2" text. What we need is a method to extract from Google the tokens/synonyms Google associates with "kw1 kw2".
Because the technology is new, we are only seeing it where adword data was there before...I think that is it.