Yesterday was an uncomfortable anniversary for ex-CNN anchor Miles O’Brien. The likable former “American Morning” host posted a Facebook update saying: “A year ago I got dumped by CNN. In a few hours, I will mark the anniversary by getting my first colonoscopy. Seems fitting.” Fol owing a 16-year tenure at CNN, O’Brien was abruptly ousted last December when the network disbanded most of its science and technology unit.