Michael Rosenblum, former WNET worker and now “on the cutting edge of the digital videojournalist revolution” (he’s worked for BBC, Voice of America, New York Times television) is vehemently proclaiming that he no longer contributes to PBS. He’s particularly annoyed — well, far past annoyed — by Thirteen’s forthcoming Need to Know pubaffairs show (Current, March 22, 2010). One problem, he writes: “Three years! The show has been in the planning phase for three years! . . . Please note that it took Marc Zuckerman two months to conceive of, build and launch Facebook.”