Chevrolet is using Klout to get highly influential Web users behind the wheel of its new 2012 Sonic subcompact auto. The company is offering three-day test-drives to 139 people with Klout scores of at least 35 in the hope of building buzz on Twitter and other social channels. "For Chevy, it's a good play, but they have to make sure that the recipients of their perks disclose that [they] received the car for free," says Edelman's Steve Rubel.

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