Twitter suggested I Follow this account, TwitterBooks:
There’s also TwitterMovies and TwitterTV. I have no idea how many of these Twitter-originated ones exist.
So, is Twitter’s aim to guide new users into the service with these “channels”? Or is their aim to make these all Promoted Tweets eventually?
Mike Cane’s xBlog 
I was surprised there seems to have been no mention of these accounts anywhere. How did people find out about them? Recommendations? According to TweetGrader, TwitterBooks joined on Dec. 3, 2011.