Google Fiber is not just some new caprice thought up by the Google founders; they have been thinking about this problem for a long time. After the San Francisco experience, Google invested in Spanish company Fon, whose software turns Wi-Fi routers into a hotspot, allowing you to share some of your bandwidth with other Fon users. In 2009, Google worked with Tropos Networks to provide free Wi-Fi to 118,000 people in Mountain View, California. In January of this year the company turned on free Wi-Fi for people in the Chelsea neighborhood in New York City.
One pundit pointed out, wisely, that Larry and Sergey are big thinkers; being remembered as just the guys who made Gmail and Google Docs won't be enough for them. Being remembered as the guys who made the first self-driving car, then the guys who made access to the Web faster and better by using fiber to bust the cable/telco ISP duopoly--they'd probably like the sound of that.
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