Google's search business might not be as water-tight as people think it is

Overall, paid search represents $70 billion, or 48%, of the $145 billion global digital ad market, according to eMarketer.
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Also, separate data from online research company comScore suggests that just 12.6% of all searches in the US were generated by smartphone users in Q4 of last year.

http://uk.businessinsider.com/the-number-of-people-using-search-engines-is-in-decline-2015-9