Little newspapers, otherwise known as tabloids or "compact format" editions, are all the rage in Europe. Will they someday come to dominate U.S. newspapers? Or, while we were looking the other way, have alien formats already made gains in the U.S. market? Are we facing, in other words, the Invasion of the Broadsheet Snatchers? It’s no secret that U.S. as well as European newspaper readership and...