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Instagram: The dog that launched a social media giant

Instagram has attracted a billion users since it was launched in 2010. Now, its founders have announced they are quitting the company.

Kevin Systrom and Mike Krieger have overseen the app's rapid rise. But what made their idea so successful? And how has it continued to grow?

The story, rather fittingly, begins with a picture of a dog.

Kevin Systrom's photograph of a stray dog sitting near a taco stand in Mexico is the first image ever shared on Instagram.

The app's co-founder captioned it 'test', and uploaded it a few months before his idea was launched to the public on October 6 2010.

A post shared by (@kevin) on

End of Instagram post by kevin

"Had I known it was going to be the first photo on Instagram I would have tried a bit harder," Mr Systrom later told The Daily Telegraph.

The candid picture - which has been liked more than 93,000 times - was the culmination of an idea he formed with Mike Krieger, who he met while studying at Stanford University.