BIA/Kelsey forecasts U.S. mobile local advertising revenues to grow from $664 million in 2011 to $5.8 billion in 2016, representing a compound annual growth rate of 54.2%. U.S. retailers will earn $54.47 billion online during November and December this year, up 16.8% over online holiday season sales in 2011. Today, cross-channel marketing is imperative.