Chart - US Online Ad Spending By Channel

Mobile advertising continues to grow faster than expected, largely at the expense of desktop ad spending, which is flattening or declining more rapidly than previous predicted, according to new figures from eMarketer.

eMarketer now expects US mobile advertising spending to reach $9.60 billion by the end of this year, up 120.0% from $4.36 billion from 2012. Spending on ads served to desktops and laptops is expected to grow just 1.69% to $32.98, down from 6.60% growth last year.

Overall, US digital ad spending, including paid media spending on ads appearing on all digital devices, will increase 15.72% this year to $42.58 billion. Read the rest at eMarketer.