Google is at once a powerful search engine and a growing e-mail provider. It runs a blogging service, makes software to speed web traffic and has ambitions to become a digital library. And it is developing a payments service.

Although many internet users eagerly await each new technology from Google, its rapid expansion is also prompting concerns that the company may know too much: what you read, where you surf and travel, whom you write.

At Wired.

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