Vine's six-second-clip superstars turn fame into cash
The social media app Vine allows users to create and share six-second videos online with ease.
In a short space of time, it's become incredibly popular with teenagers, and its stars - called Viners - are increasingly being paid to promote products to their young followers.
But the Viners are mostly teenagers themselves. And without the benefit of an entourage of publicists, the advertisers are taking a risk associating themselves with uncoached youngsters thrust into the public eye.
The BBC spoke to three Viners in Los Angeles.
Produced by Regan Morris, Travis Peterson and Jack Garland.