Instagram?s User Base Explodes, Surpasses 40 Million

There's no stopping Instagram's winning streak. On Friday, web developer Rakshith Krishnappa noticed that in the 10 days since CEO Kevin Systrom announced the service had hit the 30 million user milestone, Instagram had added another 10 million users to its list.

Source: http://www.wired.com/gadgetlab/2012/04/instagram-40-million-users/

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