Twitter with students?

I'm just not sure I see a fit for twitter in schools. Promoting it with teachers also, then, promotes the idea of sitting behind your desk glued to the twitter stream, and Heaven knows we don't need any more of that. Skype, at least, isn't a stream and therefore you don't have to be watching it in order to use it.

And I know I'm swimming against the current with this one, too, but I don't think it's a tool for students at all. I do hear folks talking about it but I just don't see it being used effectively. Sometimes I think that folks dream of the following as being the kinds of conversations that students would have using twitter:

S1: In Bio listening to a great lecture on cell division. She ROCKS!
S2: Reading "Chapter 7" for Mr Wilson. Not my favorite so far but I'll get through it
S3: Great quote from Mr B: "History is written by the winners." He said it's not his original quote, tho'
S4: @S1 Mrs D is awesome! Looking forward to 5th period when I'll hear it, too
S4: @S2 Tell me about it. I've got to read it tonight. But I'm a fast reader.
S2: Anyone know a good website to help me to understand Chapter 7?
S1: @S3 Yeah, I heard that quote before, too. Hold on and I'll look it up for you.

Now, THIS is what would PROBABLY happen if students used twitter:
S1: wht's 4 lunch? I'm staving!
S2: NFW I'm readg that @#$ Chapter 7. Hes got 2 B Sh*ttin' me!
S3: "History is writn by th winners?" DUH!
S4: I get out of her class 5th period, dude! S*cks 2 B U!
S4: @S1 its only 9:30 dude! U cnt B hungry alrdy U pig!
S2: Any1 know if any of ths @#$% in Ch 7 will B on the test?
S1: @S3 No duh! Who ELSE wld write it. Hes so lame!

We just CAN'T project our learning styles and our love of our PLN onto the students. Just doesn't work - IMHO.

:-)