Selena Gomez has been letting some other people do the talking on her Instagram this week in order to teach about the work of black activists and history of systemic racism.After earlier ceding the stage to Black Lives Matter co-founder Alicia Garza, New Yorker writer and Columbia University professor Jelani Cobb and Harvard University African & African American Studies professor Sarah Elizabeth Lewis, among others, on Wednesday (June 10) Gomez passed the mic to activist and rapper Killer