Do you twitter?

I set up a twitter account (yay, me!) just now, but I don’t know if I’ll use it.  In any event, I’ve at least “called dibs” on the name (yeah, “janetheactuary” of course).  If I find it to be useful, I’ll follow the instructions for putting a twitter-feed widget on the blog, but not yet.

Is it useful?  A time-suck?  An addictive time-waster?  Are there people I should follow?  Tricks I should know?

I can’t really see myself tweeting a lot myself.  Is Twitter useful for inviting people to send useful article to my attention?  How does that work?  Or is it really just for seeing what others have tweeted?  (Apparently, instapundit tweets incessantly.)

Your thoughts, please!