Some security concerns raised about the app at the centre of a popular social media trend are exaggerated, but experts say the developer should be more transparent.

This week, two years after being widely panned for a filter that critics described as little more than "digital blackface," FaceApp, a photo-altering smartphone app, found itself at the centre of a popular social media challenge.

A range of celebrities had been using the app's age filter to modify photographs of themselves and provide realistic glimpses of what they could look like decades in the future. But then the backlash started.

The app,

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