The social photo sharing app won 100,00 users within a week of launching and now has 4.25 million users who post 10 photographs per second using the app.

We talk to a lot of startups in an average work week and hear one specific question a lot – how did Instagram grow so fast?

The social photo sharing iPhone app launched in October and gained almost instant celebrity among users even before the startup had real office space. Winning 100,00 users within a week of launching, it now has 4.25 million users who post 10 photographs per second using the app. Used by both domestic and international users, especially in Japan, it has seen steady growth since Christmas and is now growing at a rate of 1.2 million new users every month. Launched by co-founders Kevin Systrom and Mike Krieger, it certainly seems to fit VC firm SV Angel's research findings demonstrating that startups with co-founders have a higher probability of being successful than those with single founders.

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