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.

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Facebook has said that 8.7 million images of child nudity were removed by its moderators in just three months.

The social network said that it had developed new software to automatically flag possible sexualised images of children.

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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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Facebook is asking British users to send naked photos of themselves to the social network, to try to stop revenge porn.

If you're worried an intimate photo of you could be shared by someone else, the idea is to get it blocked before it appears online.

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While Facebook desperately tightens controls over how third parties access its users' data - trying to mend its damaged reputation - attention is focusing on the wider issue of data harvesting and the threat it poses to our personal privacy.

Data harvesting is a multibillion dollar industry and the sobering truth is that you many never know just how much data companies hold about you, or how to delete it.

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With the Cambridge Analytica news, there has been lots of talk in the media about leaving Facebook, but do we really have to leave Facebook to protect our privacy? And if we decide to leave, how can we do that?

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