Since white police officers recently killed unarmed black men and boys in New York, Cleveland and Ferguson, Missouri, street protests have continued around the country and put America’s justice system on trial. There’s unequal treatment not just in the use of force but also the power of prosecutors to racially profile criminal suspects. Overt racism may be on the decline, but fear, unconscious bias and stereotyping are harder to recognize and overcome. Will sharing experiences on social media help close the gaps? Will training programs lead to reforms?