CTP (Click through popularity) is not a factor in any major SE natural algo as far as I know. YAhoo, is concerned with tracking user behavior with clicks so that they can report via overture on the PPC side, it is not a determinant in actual natural serps. Google uses CTP in their google adwords campaigns (CTP x PPC = Position) but also does not use the technology for natural rankings (Way to easy to game)

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