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think of them as placeholder for future development ... and how often they are duplicated
[edited by: Robert_Charlton at 6:59 pm (utc) on Jun 3, 2010]
[edit reason] typo fixed at poster request [/edit]
In this response he does mention long-tail, but he puts more emphasis on the idea of returning what Google feels are "better quality sites." He keeps saying "sites" rather than pages - so that may well be a big clue to what's going on.