From trialling the removal of "likes" from Instagram to taking cues from China's superapp WeChat, Mr Zuckerberg heralded a number of changes to Facebook's broader social network.
Proclaiming "the future is private", Mr Zuckerberg signalled that Facebook's News Feed would be de-emphasised in favour of revamping its messaging app, online marketplace and video-on-demand site.
A BBC investigation has found extreme material encouraging and glamorising eating disorders on the social media platform Instagram.
How do we know what's real and what's fake?
Why did Kelsy have a tattoo of Harry on her face? Watch the video for her explanation.
Molly Russell, 14, took her own life in 2017. When her family looked into her Instagram account they found distressing material about depression and suicide.
Molly's father Ian says he believes Instagram is partly responsible for his daughter's death.
Five years ago Ashleigh wouldn't have dreamed of sharing a selfie on Instagram.
But then she discovered Instagram's recovery community - other people like herself who posted about the highs and lows of living with an eating disorder.
The app collects GPS coordinates on users even when they're not using it. By sharing that data, both Facebook and Instagram could collect huge amounts of information on users to better target ads.
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