Earlier quoted context omitted.
They became the defacto place for public discussion instead. The focus on 3rd party api's hindered that and would have hurt their growth in that regard maybe? Journalism happens on twitter first, it's where famous people talk to each other, not facebook, yeah?
I am not sure I would call what happens on Twitter discussions. It's a great platform for posting things that are easily misunderstood or taken out of context due to their brevity. Then someone starts a witch-hunt, which in turn sparks a counter-witch-hunt. In the end no one is any wiser, but everyone is little more bitter. I think the appeal of Twitter is feeling "in the loop" due to the real-time nature of the serv…
It's true that it's a poor platform for adversarial conversation or debate, but that's no reason to dismiss the whole thing.
I've been on Twitter for seven years and in that time I've curated a timeline which is, bar none, the most entertaining and informative web destination available to me, specifically tailored to my interests and disposition.