I love anything by Joan Didion. Incidentally, she was one of the local moms when I was growing up in Point Dume. She always reminded me a little bit of my mother, so I feel a great affinity. I love the precision of Didion's writing. There's a construction and a craftsmanship to her sentences that's imbued with so much emotion.
One of the interesting things about Twitter is looking how famous people choose to use it. Take someone like Steve Martin, who I follow: it's all sorts of comic gems, nothing private, nothing personal - all jokes. Other celebrities are overtly personal - like Charlie Sheen. I do a mix of observations and updates.