As white nationalist protests prompted a surge of violence in Charlottesville, Virginia this weekend, two separate conversations emerged online. For many, the events marked a tragedy, punctuated by an attack on counterprotesters that caused one death and the injury of 19 others. For others, particularly in far-right and neo-Nazi communities, the violence was something to be made light of, or worse, celebrated. And those conversations found homes across social communities, especially on Facebook and Reddit.Now, those tech companies are taking action. Reddit and Facebook have each banned entire hate groups in the wake of the Charlottesville attack, they confirmed to CNET today.