Kevin Systrom

CEO and co-founder of Instagram Kevin Systrom attends a session at LeWeb Paris 2012 in Saint-Denis, near Paris on December 5, 2012. AFP PHOTO ERIC PIERMONT (Photo credit should read ERIC PIERMONT/AFP/Getty Images)AFP AFP/Getty Images
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Instagrammers, rejoice! You were indeed on to something when you came in droves to the new photo app two years ago. So were we: Systrom, No. 39 on last year’s list, this year sold his baby to Facebook for $1 billion (because $1 million isn’t cool). Systrom says the 16-person Instagram team is still independent within Facebook, and in 2013 will expand. Indeed, Systrom isn’t going anywhere: “Other people sell and check out,” he says, “but we have no interest in doing that. When the founders leave, that’s when the soul of a company goes away.” Mobilize: Word has it that Systrom will be a key player in beefing up Facebook’s mobile presence. –D.R.