2012年4月谷歌在中国推出DoubleClick Ad Exchange（广告交易平台）。2013年初，腾讯、新浪先后加入实时竞价阵营，推出各自的私有广告交易平台。
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By 2009, Google had developed DoubleClick Ad Exchange, a much more efficient ad marketplace.
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And on Tuesday, Google announced that it will allow publishers, not just advertisers and agencies, to buy ads on its DoubleClick ad exchange.
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Another purchase option is Right Media, an online ad network that has hosted since 2003 an open ad exchange similar to DoubleClick's offering.
FORBES: Magazine Article
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