Google will again take a majority – 53% — of all mobile ad dollars this year, according to eMarketer, the research company. It’s the second year in a row that Google has dominated mobile advertising. And it’s the second year in a row that Google’s competitors for mobile ad dollars — Facebook, Twitter, Pandora, Millennial Media, and others — look like minnows compared to the search giant. The new numbers throw a bucket of cold water on claims by Google’s rivals — including Millennial — that they have networks that rival Google’s. Google’s next biggest competitor, Facebook, is projected to take ~16% of mobile ad dollars this year, eMarketer believes. All the other companies will get less than 3% of the remaining dollars. Google takes a much smaller slice of all total digital ad revenue, including non-mobile ads, eMarketer says.