Nearly 30% of all web traffic is coming from smartphones and tablets, according to web tracking firm StatCounter, and as Business Insider's CEO and Editor in Chief Henry Blodget is fond of saying, "Money follows eyeballs."U.S. mobile ad spending more than doubled from 2012 to 2013, and eMarketer predicts strong growth of more than 50% in 2014. While mobile marketers have for years been championing the idea of "the year of mobile," it appears their day has finally come.