I've spent I don't know how many hours messing with twitter and I just don't understand what value it is. The new tweets come in so fast you aren't going to read any of them. (I'm using TweetDeck) Virtually everything there is a short blurb about some ones business which would be ok except that there are 10,000,000 of them so again I don't see that anyone is every going to look at anything that's linked there. I suppose there may be some value to the fact that there is a link to your site in a high value site like Twitter.
Maybe someone could enlighten me.