Two weeks ago today, the sitcom Roseanne and its star Roseanne Barr was the toast of ABC’s upfront presentation, with network execs joking onstage about Barr’s controversial Twitter feed. But in a stunning turn of events, the network has canceled the show following Barr’s racist tweet this morning about President Obama’s White House adviser Valerie… https://www.adweek.com/tv-video/abc-cancels-roseanne-following-roseanne-barrs-racist-tweet/