You don't get "breaking news" with Twitter. You get "breaking observations". Did those people that saw the plane splash into the Hudson know WHY it had to land in the river? Did they know the flight number? Who the pilot was? What his conversations with the tower were? What options he was given before having to land in the Hudson?
If I see a car crash, and I blast it out on Twitter, I'm not "reporting", I'm observing. I have no idea if one of the person in ths crash was drunk, they had brake failure, or anything relevant to the cause.
Have you ever seen a reporter trying to "report" something "real time" on TV? They are HORRIBLE. Because all they are doing is telling you what they are seeing. They are giving you no context, no insight, no background, nothing. That is what Twitter provides when people think they are "reporting" on something. Not saying it's bad. Just different from real news reporting. Those that believe that it is just as good, or better than actual reporting are delusional.
That's an even better distinction than the one I made about quality vs. immediacy. As media continues to evolve, I hope that this distinction is not lost, because it's too important to understanding.