Are you deciding where to spend your digital ad budget? U.S. digital ad spending will reach $41.9 billion this year, up 14 percent over 2012, according to eMarketer. However, while mobile advertising is growing by leaps and bounds, spending on desktop ad formats has slowed faster than expected—so fast that experts wonder whether spending on desktop formats like search and banners has slowed for good. Desktop spending is projected to drop from an expected $35.39 billion in 2014 to $32.51 billion in 2017. With the time consumers spend with mobile devices increasing each year, many businesses are looking to shift ads to mobile.