*Oprah Winfrey is very happy, announcing that her “Oprah’s Next Chapter” episode featuring Rihanna topped all key African American demos in its time period on all of broadcast and ad-supported cable.“Oprah’s Next Chapter” featuring Rihanna also ranked No. 2 in all of primetime and was No. 1 in its time period with women 18-49. It was the second highest rated telecast in OWN history.