“First, on the most obvious level, Twitter needs to be differentiated from what people write on Twitter. The fact that so many people now use Twitter as a public email system, or as a way to instant-message their friends in front of other people, is immaterial; Twitter is a note-taking technology, end of story. You take short-form notes with it, limited to 140 characters. The clichéd analogy here has been with Japanese haiku, but perhaps we might even reference the Oulipo: in other words, Twitter means that you are writing, but you are writing within constraints.”