No matter where your sympathies lie, nobody can deny that the events in Charlottesville on Saturday were tragic. As tensions that have been simmering for months erupted to a full boil this past weekend, opposing forces have been rallying their respective mobs in ways that harken back to the 1950s and ’60s in this country, and even the 1860s and ’70s. But with a twist: this time the mobs have taken not just to the street, but to social media, and vigilante justice has become online vigilante justice.