The peculiar characteristic of the digital market is that it seems almost inevitably monopolistic, one company dominates a function. This has to do with critical mass, and it has to do with the cabal of industry people who support each other’s businesses, and with the basic tech model, which is consolidation and control. Twitter, which began as a tool for sharing abbreviated blog posts, has now evolved into a major part of the news media. It may be the most significant advance in news since, if not linotype and the telegraph, then, at least, cable. As with cable, every new news event of consequence advances Twitter’s presence and clout. It is first responder news; it is a real time news index; and, for more and more news consumers, it is background or passive news, like local radio once was, but on an international scale.