He's started replying to some of his tweets via these short little YouTube things (that's why he starts out by saying, "So and so tweeted..." If you look at the video on YouTube here , down the right side you'll see several that are labeled with the @ sign -- those are responses to tweets. He's done two or three back and forth with Alyssa Milano that are hilarious, but he also answers just random tweets, like the library request. I'm sure it's all a guerilla marketing campaign but they're still really funny. Here's one where he responds to his daughter Hayley. Enjoy!