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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It's a sensational story containing allegations of sleaze, psychological manipulation and data misuse that has provoked an internationally furious response.

Tech giant Facebook and data analytics firm Cambridge Analytica are at the centre of a dispute over the harvesting and use of personal data - and whether it was used to influence the outcome of the US 2016 presidential election or the UK Brexit referendum.

Both firms deny any wrongdoing.

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Nine-country study finds widespread use of social media for promoting lies, misinformation and propaganda by governments and individuals. Propaganda on social media is being used to manipulate public opinion around the world, a new set of studies from the University of Oxford has revealed.

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