No Flashing Matter

Imagine you're in a crowded tube carriage during rush hour, or fighting for standing room on a bus journey, or just passing the time in a coffee shop and your phone vibrates.
The reply you've been waiting for, an important email?

No, it's an unwanted, unpleasant, explicit image and you don’t know who it’s from.

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No Flashing Matter looks at Cyber Flashing - What is it? What is it like? What is being done?