When George Zimmerman was acquitted of killing of Trayvon Martin in 2013, #BlackLivesMatter began trending on Twitter. In 2014, after the deaths of Michael Brown in Ferguson, Missouri and Eric Garner in New York City, the movement gained even more prominence.And now, at the time of writing, in the summer of 2016, after two more killings of Black men at the hands of police officers, along with the killing of five police...