NEW YORK--(BUSINESS WIRE)--Today, leading cultural ad agency Gravity officially launches its agency trading desk CMYK Audience. The trade desk effectively becomes one of the largest of its kind to reach more than 65 ethnic audiences online within the United States. CMYK Audience is capable of targeting these ethnic audiences online whether they are surfing the Web on their personal computers, tablets or smartphones. The ethnic segmentation combined with more commonly-used behavioral segmentatio