For its simple, brilliant application of crowdsourcing: providing turn-by-turn GPS navigation for fellow drivers. But Waze's 10 million users--1.5 million of which joined in December 2011 alone--aren't just looking out for themselves. Waze users filed more than 25 million road reports in 2011 to give other drivers a heads-up about traffic jams or accidents. In February, it added its own voice-control feature to make it more useful for drivers on the road.

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