In about 200 cases, the developer created a way to track a device's identifier code; the other apps used this functionality from advertising or tracking software library.

在大约200个案例中，开发商创建了一个追踪设备识别代码的方法。其它的应用程序通过广告或追踪软件库使用该方法。

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Most important, tracking helps you decide how to readjust your advertising program periodically to make your budget work its hardest.

最重要的是，跟踪有利于决定如何定期调整广告计划，以使预算最充分。

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Whatever system you use, unless you've done a coupon promotion and can simply count the number of coupons redeemed, tracking is the only way you can assess how effectively your advertising is working.

无论使用何种系统，除非您已经做了优惠券促销并可以计算出优惠券的数量，跟踪是评估广告有效性的唯一办法。

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Despite these promises, the FTC charged that Google placed advertising tracking cookies on consumers' computers, in many cases by circumventing the Safari browser's default cookie-blocking setting.

ENGADGET: Google to pay $22.5 million to settle FTC charges over tracking cookies in Apple's Safari browser

Because of the particular operation of the Safari browser, that initial temporary cookie opened the door to all cookies from the DoubleClick domain, including the Google advertising tracking cookie that Google had represented would be blocked from Safari browsers.

ENGADGET: Google to pay $22.5 million to settle FTC charges over tracking cookies in Apple's Safari browser

"Users don't want more advertising or tracking, and Facebook wants to do more of both, "said Jan Dawson, an analyst at Ovum.

WSJ: Facebook Shows Off New 'Home' Software for Android Smartphones