Having large sections of the crowd looking at their phones, not at the action on the pitch, could undermine that. There's a balance to be struck, he says.
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"We have an expected behaviour pattern [for protests]," one police officer has told the BBC anonymously. "But with this new generation, we do not understand their social media or how they mobilise on the ground."
Author(s): Yukinari Ikeda, Akio Ishii