I'm not on Twitter (yet), either personally or "professionally." Don't plan to be, personally, ever.
I'd like to pose a completely serious question, to those who are:
What do you get out of Twitter?
And one more:
If everyone follows your example and gets on Twitter, will you continue to get out of Twitter what you get out of Twitter now?
Oh, and a third:
Aren't you a little concerned, as I am, that Twitter will turn into a combination of Fritter and Clutter?
As I said: These are serious questions, not meant to be smart-ass.