Instagram Captures 100,000 Mobile Photo Addicts In Less Than A Week

While Instagram's "overnight" success is certainly impressive, it's worth noting that this wasn't the team's first product. Instagram was a "pivot" from Burbn, an in-browser foursquare of sorts.

Founder/CEO Kevin Systrom tells the full backstory on Quora here: http://www.quora.com/Instagram/What-is-the-story-behind-Inst...