Justin Bieber takes pic of L.A. traffic, sends Instagram traffic

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A photo from Justin Bieber is worth thousands of new users.

The tween heartthrob signed up for Instagram, and the iPhone photo-sharing service exploded.

Bieber posted a photo of snarled L.A. traffic to his 11 million-plus Twitter followers. That triggered another surge for Instagram, which is nearing 7 million users. Last month the 9-month-old service hit 5 million.

Instagram already had its celebrity users such as Snoop Dogg. But Bieber has a following as large as some countries. And they are headed to Instagram, where Bieber already has thousands of followers and the snapshot has hundreds of likes.

https://twitter.com/#!/justinbieber/status/94199094460940288

Check out our profile of Instagram founder Kevin Systrom.

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-- Jessica Guynn