Twitter drives a tenth of the traffic that Facebook does to news sites. So why are journalists so obsessed with Twitter?

Well, there’s a good reason:

The reason, I think, is that Twitter is simply more useful for our jobs. For better or worse, it’s where news breaks today. It’s also where a lot of real-time reporting happens.

And a bad one:

The fact that so many journalists are on Twitter has made Twitter incredibly professionally valuable to journalists. Tweeting your articles ensures they’re seen — and discussed, and retweeted — within a community that includes not just your friends and peers, but the people who might hire you someday.

There’s also one he doesn’t mention: Facebook is harder to use than Twitter. To get maximum return from it journalistically, you have to cultivate a subscriber community, understand how the algorithm-that-replaced-Edgerank works, and be prepared to maintain a community so that your posts keep appearing in news feeds. Twitter looks broadcast-y enough that journalists can get their heads around it easily.

Still, missed opportunity…