You have another follower...as starfish.
Oh good! :)
I haven't found a reason to be on Twitter yet. If it weren't for family, I probably wouldn't be on Facebook either. Let us know if it's a beneficial for your book.
And I can't yet bring myself to join facebook, with its lack of control for the user. So far, my blog traffic has increased dramatically since I joined twitter, so that may be indirectly good for the book. (I can hope.)