"The Activist" judge Julianne Hough says she has shared her "concerns" about the CBS competition series with its producers following backlash to the reality show announced September 9, which is described as featuring "six activists from around the world working to bring meaningful change to one of three urgent universal causes: health, education and the environment." "The last few days have been a powerful demonstration of real-time activism," the former "Dancing With the Stars" pro wrote in a statement posted to Instagram Tuesday. "Thank you for using your voices, . . .