LOS ANGELES — Justin Bieber might be the modern king of all media. The teen heartthrob has the Web wired – he's a YouTube discovery with almost 6 million followers on Twitter. He makes hit music, with an album and concert tour in the nation's top 20 and a new album on the way in a few weeks. He's got a movie coming out early next year, and on Sunday, he drew enough fans to temporarily shut down a Barnes & Noble bookstore where he promoted his autobiography, "First Step 2 Forever: My Story." More than 1,000 teen and tween girls, a handful of boys, and their parents waited in a l...