“Up in the Air” novelist Walter Kirn took to Twitter to bitterly complain that he wasn’t invited to the Academy Awards. The movie is nominated for six Oscars, including Best Picture and Best Adapted Screenplay, and stars George Clooney, Vera Farmiga and Anna Kendrick. “Caution to writers: Don’t expect that because you write a novel that becomes an Oscar-nominated film that you’ll be invited to the Oscars,” Kirn posted yesterday. He said he’d begged Paramount and even thought about trying to get in by requesting press credentials. Kirn compared himself to a pilfered natural resource: “Novelists are like oil in H’wood: they drill us, pipeline us, pump us and then burn us.” A Paramount rep told us, “The Academy has a process that we are following and we are respectfully waiting for them to allocate additional tickets. Of course, Walter Kirn is on our wish list for seats, as are producers and executive producers of our film who do not have seats yet.”