For example, the top 50 websites in the us on average installed 64 pieces of tracking technology onto the computers of visitors, usually with no warning.

例如，全美最大的50家网站平均在访问者的电脑上安装了64种追踪技术，而且通常都没有任何警告。

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It is now easy, for example, to experiment with changes in the layout of a website, showing different configurations to different visitors and tracking results in real time.

例如，现在很容易实验网站布局改变的效果，向不同访客显示不同的配置，并实时跟踪结果。

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The study found that the nation's 50 top websites on average installed 64 pieces of tracking technology onto the computers of visitors, usually with no warning.

在大多没有警告的情形下，全国50大网站在访问者电脑上平均安装了64项追踪技术。

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Of course, tracking unique visitors does not give the full picture of a Web site's popularity.

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The goal was to provide thousands of New Orleans visitors with direct customer service by tracking relevant social media conversations on several different platforms within a 10 mile radius.

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According to comScore, a Web tracking firm, the site had 44 million unique visitors in June.

CNN: Twitter hit by denial-of-service attack