With two billion Web pages already in its index and with its close tracking of user behavior, Google had exactly the information needed to tackle this problem.

利用已经索引的20亿个网页和仔细跟踪用户获得的信息，Google已存储了足够的数据解决这个技术问题。

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The point of tracking your site is to act on the information you gather and use it to improve your web site's effectiveness.

跟踪站点的要点在于在你收集的信息基础上行动，用它来提高你的网站的效力。

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She also says that, while Acxiom does store personally identifiable information, it doesn't store or merge anonymous online-tracking data, such as Web-browsing records.

WSJ: Insurers Test Data Profiles to Identify Risky Clients