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I wouldn't be so sure SearchWiki has no influence. It's data; Google has it; they didn't get where they are by ignoring free user-behavior data.

It's not explicit, just like all sorts of other ranking details and polcies are secret, to keep manipulators in the dark as long as possible.

They explicitly state they don't use SearchWiki to influence ranking right now.

"At this time we aren't using SearchWiki to influence ranking but it is easy to see how that could happen in the future," says Marissa Mayer.

I suppose they are going to wait until they get a meaningful amount of user data before they start using it.

It's already 6 months "in the future" from that statement. Google also didn't get where they are by waiting indefinitely to do 'easy' things.