eMarketer projects RTB digital display ad spending in the US will account for 29.0% of total US digital display ad spending by 2017, or $9.03 billion. In 2013, it will account for 19.0%, or $3.37 billion. These estimates are revised slightly upward from our previous forecast in August 2013, which expected $3.34 billion in RTB spending this year. The revisions are due to an overall increase in projected digital display advertising. Read the rest at eMarketer.