The move will also affect how the results from the 10-year-old Google Shopping site appear in the main search engine.

WSJ: Google Makes Shopping Site Pay-to-Play

Kirjner adds that the fact that PC search, mobile search and YouTube are reported together under Google Sites revenues, which grew about 20% year-over-year in the fourth quarter, suggests that if PC search growth is declining quickly, then mobile search and YouTube must be growing fast.

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