I quietly re-registered after firstly adding a few folk from here, and then deactivating quickly thereafter. I have no interest in adding people I know on Twitter - I add celebrities, sportsmen & the like.
So far, I've had a fair few of my Tweets replied to, by the likes of Chris Evans, Iain Lee, Kevin Smith & the sort. It's OK, but I don't use it at home. It's solely a diversion to & from work on my HTC Desire.