Let me give you just one example of the value of Twitter. Yesterday, I read Andrew Ross Sorkin's column in the New York Times and tweeted to him:
And, two minutes later, he answered:
Now, I ask you, where else can you leave a comment, or ask a question, and get a response so quickly (or at all)? Try doing that with a letter to the editor or by leaving a comment in the comments section after a piece.