Like many young activists of her generation, Johnetta Elzie got her first taste of resistance online — speaking out against the 2011 execution of Troy Davis to her then-small Twitter following.

"I was just determined to be a part of the change. I was determined to at least be able to say, 'I tried,'" Elzie says.

Demonstrators protest the execution of Troy Davis at the White House in 2011. Photo by Paul J. Richards/Getty Images.

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