Google's share of the U.S. mobile search market fell by 14 percentage points to 68.5% last year, and it will shrink further as more people turn to mobile applications to search the Web, according to an eMarketer report. It projects that mobile ad revenues will almost double this year to $9 billion, more than half of which is mobile search spending. Google also faces pressure from the growing popularity of rivals such as Microsoft's Bing.

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