![Justin Bieber Posts on Instagram, Quickly Gets Thousands of Followers [PIC]](http://mashable.com/wp-content/uploads/2011/07/justin-bieber-instagrampic.jpg)
Justin Bieber just posted his first photo on an Instagram account, and according to Photorank.me, he garnered more than 1,700 followers in his first hour of using the service. How do we know it’s actually Justin Bieber’s account? First, Bieber linked to this picture from his Twitter a…
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