Police in Louisiana shot and killed Alton Sterling on Tuesday. A day later, police in Minnesota fatally shot Philando Castile. Both men were black. And both shootings were captured in grisly videos by bystanders—videos that quickly circulated on social media. Here, law professor Jessica Silbey talks about the role technology now plays in influencing the conversation about race and policing, and the constitutional right of citizens to record law enforcement in public.