There are a lot of Twitter dismissives among science bloggers, but the mobile technology has promise, journalists and others just have to understand how to structure its use successfully.
One such constructive application was pioneered here at American University by journalism professor David Johnson and used by students and collaborators in last year's November election. Read or tweet about Twitter Vote Report, an application that is cleaning up among this year's journalism and technology awards.
It's really good that you keep an open mind about new technologies like this. As you say, some of these things get oversold, then meet with a big backlash. It takes time to figure out how they really function. Most educational technology initially gets oversold by the manufacturers, resulting in a backlash, until finally finding the proper role.