Justin Timberlake and his long hair got to work yesterday on The Social Network in LA. He's been logging long hours on the movie's set recently, but it's his music that's earning him praise these days — JT just picked up three Grammy nominations for his work with Ciara and TI. Before that ceremony goes down in January, Justin is expected to present at next week's Teen Nick HALO Awards, which celebrates young people who lead and help others.