Your title, "21 Recipes for Mining Twitte"r contains code written for V1 of the Twitter API, and is now "defunct" (as described by its author at https://github.com/ptwobrussell/Recip...).
As the author is clearly now working on Mining the Social Web instead and the 21 Recipes title is useless (if not misleading), I thought I'd better ask:
1. Whether you're aware of the issue?
2. Whether you intend to remove the title from sale?
That was all I had to say :D keep on doing great work!
I'm sure that we aware that this title is a bit dated but I don't believe there are any plans to remove the title from sale. We do have other books that are still available for sale that are considered obsolete that customers do still purchase and use.
Customer Service Rep,