With near to 70 billion impressions flowing in each day via open advert exchanges, publishers have usage of a larger pool of prospective buyers and wider publicity.垂直类广告网络根据品牌广告主的主流需求，来采购相关的垂直媒体，譬如汽车类广告有很大的投放预算，有些广告网络就包断相应的汽车类