Effectively Using Twitter to Promote Your Book

"One of the extra perks of having your book featured on BookBuzzr is that BookBuzzr community manager Freya tweets about your book to over 10,000 followers. But if you yourself are not on Twitter, you’re losing out on optimizing the tweets about your book. [...]"

http://www.bookbuzzr.com/blog/book-marketing/effectively-using-twitter-to-promote-your-book/