How I Built This with Guy Raz

Instagram: Kevin Systrom & Mike Krieger

We're hard at work planning our upcoming live shows, so we bring you this favorite from the last year: Instagram. Kevin Systrom and Mike Krieger launched their photo-sharing app with a server that crashed every other hour. Despite a chaotic start, it became one of the most popular apps in the world. PLUS in our postscript "How You Built That," we check…