The co-founders of photo-sharing giant Instagram, Kevin Systrom and Mike Krieger, are both leaving the firm.Instagram, purchased by Facebook in 2012 for $1bn (£760m) in cash and stock, has more than a billion users.The BBC understands that tension started to grow between Mr Systrom and Mr Zuckerberg as far back as 2014 when Facebook purchased WhatsApp.The social network spent $19bn on the chat app in 2014, and Instagram's co-founder is said to have become concerned that he had sold out too soon.He also saw Snapchat prosper - an app Facebook had tried and failed to take over.The firm was quite deliberately treated like a separate company owned by Facebook, rather than merely a department or division, because it was Instagram's culture that made it such a valuable acquisition.Kevin Systrom and Mike Krieger were responsible for that culture - the entire feel of an app that was in many respects the anti-Facebook. It lacked the clutter and noise that had made Facebook bloated in many people's eyes.nstagram had about 30 million users in 2012, the year it was purchased by Facebook for what appeared to be an eye-watering $1bn.
