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When it comes to shedding light on police violence, the smartphone is an exceptionally powerful tool.

Videos that show the deaths of black people due to police brutality — from Eric Garner in 2014, to Alton Sterling and Philando Castile just this week — have started and refocused conversations around policing in the U.S.

As more and more people become empowered to hit "record," the country grows in outrage over the violence directed toward people of color, adding momentum to movements like Black Lives Matter and #SayHerName that demand change.

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