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Checking in: A protester at Grand Central Terminal appears to check social media during the highly visible protest
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Closer: The protester leans to one side, holding his cell phone aloft while a man next to him also checks his
In some, a majority of participants at events in highly public places such as New York City's Grand Central Terminal, the White House or busy city intersections, are glued to their touchscreens.
The die-ins are designed to raise awareness and express outrage at the cases of Michael Brown, who was shot dead in Ferguson, Missouri, by officer Darren Wilson in August.
In November a grand jury declined to indict the officer, a decision which prompted a tide of outrage from civil rights activists, who made calls for legal reform.
Eric Garner, a man killed on Staten Island, New York, by the NYPD, who put him in a choke-hold this summer, has also been incorporated in many of the protests.
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Playing 'dead': Three students in this corridor at one of Penyslvania State University's campuses didn't get the memo about laying still
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Spotted: Two protesters on the ground can be seen bathed in the light of their devices, with the Washington Monument in the background