(Mobile marketing, one of the newest marketing methods, is booming like mushrooms after the rain. According to the latest data from the US market research company eMarketer, the total investment in mobile advertising in the United States in 2011 will reach 1.23 billion US dollars, an increase of 66?ver the previous year, and it is estimated that it will increase to 4.4 billion US dollars in the next four years. The data is only 320 million US dollars, and in 2009 it was only 416 million US dollars.)
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