在过去几周里，一场争论说明了这种精细的信息对于广告商的价值：广告商是否可以认为用户愿意被跟踪并投放行为广告？
In the past couple of weeks a quarrel has illustrated the value to advertisers of such fine-grained information: Should advertisers assume that people are happy to be tracked and sent behavioural ads?
网上投放广告比电视或书面广告价值要小得多。
Online advertising is worth much less than television or print advertising.
许多报纸读者转向了网络，这对广告商来说投放广告的价值就下降了。
Many newspaper readers have moved online, where they are worth less to advertisers.
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