Google also took in one-third of all digital ad dollars spent globally, according to eMarketer, in its first figures on worldwide digital and mobile advertising at major Internet companies.
The eMarketer figures showed Google had USD 4.6 billion in mobile ad revenues, a figure expected to rise to USD 8.85 billion in 2013. That would bring its market share from 52 per cent in 2012 to 56 per cent this year.
That would account for a 12.9 per cent share of the global online mobile advertising market, eMarketer said.
Among the others in the mobile ad sector is online music group Pandora, which is expected to see revenues jump to USD 400 million this year, but with its market share slipping slightly to 2.5 per cent.
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Twitter meanwhile is expected to increase its share to nearly two per cent this year with USD 310 million in revenues.
EU anti-trust authorities have been investigating Google's dominance of online search advertising platforms.