Somebody tell Biz Stone and Evan Williams to get the zin and gruyere ready, because here comes the NPR set. This American Life host Ira Glass and Juno screenwriter Diablo Cody just joined Twitter. Glass's first reports need more dramatic music: "I already have 4 followers and I haven't told a soul that I've created a twitter account. This is fun!" Cody seems more comfortable. " My Dog is Currently: showing a dehydrated cow penis who's boss," she writes. Meanwhile, Hitwise reports that Twitter ranked #439 among social networks and forums last week, and #4,309 among all websites. So, despite growing eightfold in the last year, the site remains quite small. Expect it to remain so. That is, until it's featured on Things White People Like.