To Tweet or Not To Tweet

To tweet or not to tweet, that is the question.  I've never really considered doing it before, in fact, I don't think I really understand how the whole thing works.  But lately I've been curious what all the hubbub is about.  I have friends that do, don't, did and then gave it up, love it, hate it, don't understand it etc.  What do you think?  Do you tweet?