Is there a word for it? If not we will soon need it. There are many such long tweet sequences I have seen, some by journalists. So it's becoming a common thing like web logs -> blogs two decades ago.
I thought there was some site that took twitter streams like this and turned them back into text. In the current scheme, where your eye can't simply flow through the text, makes them unreadable and useless to me, so I no longer even try.
