The five hundred million club, a club that by far surpasses the very ordinary and not nearly as auspicious hundy club. One of which Instagram is now a gold star member.
Half a billion users calls for an explanation; how did the photo sharing app actually come to be?
Well, it all started when Kevin met Mike. Much like when Harry met Sally - a perfect match but minus the romantic plot line.
Launched in October 2010 as a free mobile app, Instagram became an immediate success and, within two months, there were already 1 million global users.
Two years later and the app had almost 80 million users, an iPhone app of the year award under its belt, and a new owner - Facebook.
Facebook acquired Instagram for one billion dollars in April 2012, a move that Systrom said at the time was imperative to changing the way everyone communicates.
Fast forward three years, Instagram now has half a billion monthly active users and according to a recent Facebook post, Mark Zuckerberg couldn't be prouder.
"More than 500 million people now use Instagram every month -- and 300 million every day. The Instagram community has more than doubled over the past two years. This is a tribute to Kevin Systrom and Mike Krieger's vision, and to people everywhere who have opened a window into their world -- from big events to everyday moments," says Zuckerberg.
"Thanks for making Instagram such a beautiful place."