Ad networks charge much lower cost per thousand ads served (known as CPMs), as low as $4 on an ad network with some targeting, compared with $40 and up for some ads on premium sites like MSN or Yahoo.

 
  • 广告联盟的广告,其千人成本只有4美元,而在MSN和雅虎之类的网站上则需要40美元。
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