Back when rocks were soft and the world wide web hadn't yet been invented, I worked on a college newspaper that, I was told, followed the same patterns as professional papers. (That is, the skills we learned doing this would transfer.) Between the journalist's story submission and the print copy stood an editor, who reviewed the story -- not just proofreading but assessing whether the research level was right, anything important had been missed, etc.
Today, in the age of instant reporting on the Internet, where a delay of half an hour is significant, what is the role of the editor? Does that job function still exist for online news sites?
(As you can surmise, I didn't end up going into journalism. But because I went into a different type of writing, I sometimes find myself talking with young folks considering writing careers and I realized I'm out of touch on this particular industry.)