What’s the point of Twitter?

I’ve noticed more and more people using Twitter. Can anyone tell me why they use it? Seems kind of like calling up your friend and saying, “I’m eating a sandwich. Look at it! LOOK AT IT!” But then again, maybe I’m just an old codger who came of age with the TRS-80 and doesn’t understand all this new high-falutin’ technology.

To me, though, it seems like one of those classic solutions in search of a problem, like anti-static spray.

Let me know where I’m going wrong here.