From just two guys at rented desks to a $715 million sale to Facebook, a second wind on Android and a mess of privacy scares, Instagram today announced 100 million people use it every month to share the way they see the world. The startup hedged its bets by being acquired just as it expanded beyond iOS, but despite what it could have sold for now, there’s no disputing Instagram’s success.

In a heartfelt blog post that smooths over the rough patches, co-founder and CEO Kevin Systrom explains the journey to building an app that’s created “a world more connected and understood through photographs.”

The untold story is that Instagram made a tough decision right after its April 3rd launch on Android. Before that it had 30 million installs on iOS. Whether it would succeed outside of the design-focused iPhone was a gamble. It could have flopped, attrition could have set…

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