The co-founders of photo-sharing giant Instagram, Kevin Systrom and Mike Krieger, are both leaving the firm.
Mr Systrom, chief executive, said they were departing to “explore our curiosity and creativity”.
Instagram, which was purchased by Facebook in 2012 for $1bn (£760m) in cash and stock, now has more than one billion users.
The exit comes amid reports of tension between Instagram’s co-founders and Facebook’s leadership.
Mr Systrom and Mr Krieger started the image sharing site in 2010, and continued to run the service after it was acquired by Facebook two years later.
What have the pair said?
Not a great deal. They reportedly only told the Facebook leadership on Monday so the departure appears pretty sudden.
In a blog post, Mr Systrom said: “We’re now ready for our next chapter.
“Building new things requires that we step back, understand what inspires us and match that with what the world needs; that’s what we plan to do.”
There was no animosity in the blog post. Mr Systrom said the pair both remained “excited for the future of Instagram and Facebook”.
Over 8 years ago, Kevin and I started Instagram, hoping to build something that would bring out people’s creativity and spirit for exploration. Now it’s time for the next chapter. A huge thank you to everyone in the community who we’ve met along the way. https://t.co/9Omyj6VHbe
— Mike Krieger (@mikeyk) September 25, 2018
This has put increased pressure on Facebook to squeeze more and more money from its users by adding new features some felt went against the Instagram app’s original focus on simplicity.