KEVIN SYSTROM, MICHEL “MIKE” KRIEGER, 2010

Simply put, Instagram is a free photo app and a social network. It was the brainchild of Kevin Systrom and Michel “Mike” Krieger; when it was launched in October 2010, very few people noticed. Pictures taken by the app look like they have had a cool vintage filter applied to it. On Instagram, you can also follow other users’ photo streams. In 2012 Facebook acquired the photo-sharing program for approximately $1 billion. At the time Instagram only had 13 employees.

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