http://www.slate.com/articles/news_and_politics/crime/2015/06/dylann_roof_the_charleston_shooter_was_radicalized_by_the_trayvon_martin.html

One of the most chilling revelations about Dylann Roof, the alleged murderer of nine parishioners in Charleston, South Carolina’s Emanuel AME Church, is that his descent into crazed and deadly racism began with a simple Google search. According to a manifesto he posted online sometime before his rampage, Roof had his “awakening” after seeing news reports about the death of Trayvon Martin. Roof describes hearing and seeing Martin’s name everywhere, looking him up on Wikipedia, and “being unable to understand what the big deal was.” After that he typed “black on White crime” into Google and came upon the website of a far-right group called the Council of Conservative Citizens. After that day, Roof wrote in his manifesto, he was never the same.