Facebook's global market share of mobile Internet ad revenue should rise from 5.35% in 2012 to 15.8% this year. Google will continue to hold the lion's share of the market, with its mobile ad revenue share predicted to rise slightly to 53.17%, per eMarketer. Google should also maintain a healthy lead in its net digital ad revenue worldwide, estimated to command nearly a third of the market this year at 32.84% to stay ahead of Facebook (5.41%), Yahoo (2.97%), and Microsoft (2.49%).

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