Twitter users are outing Charlottesville demonstrators

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White nationalists, neo-Nazis and members of the "alt-right" clash with counter-protesters as they enter Emancipation Park during the "Unite the Right" rally.(Photo by Chip Somodevilla/Getty Images)

 (CNN) — An online crowdsourcing campaign is underway to identify demonstrators who attended white nationalist rallies in Charlottesville, Virginia, over the weekend.