Thanks for your potential interest in my new book. I just wanted to let you know that if you're considering buying a copy of Mining the Social Web but aren't quite sure about something, I'd be glad to answer any of your questions here in this forum or on Twitter. Just send a tweet to @SocialWebMining -- the official Twitter account for the book, and I'll reply as soon as possible.
If you haven't checked it out already, you might also want to take a look at all of the source code at http://bit.ly/biais2 -- this source code will hopefully tell you a lot about the book, and you're free to fork it and have fun with it even if you don't want to buy the book. All I ask is that you please send me "pull request" if you fix any bugs or make improvements that are worth sharing with others.
The code you'll be interested in is in the "python_code" directory, and is organized according the following naming convention: chapter__example_description. So, introduction__retweet_visualization.py - See http://bit.ly/cBu0l4 - would be an example from the introduction that shows you one possible way to visualize retweets.
At some point, I hope to update the GitHub wiki to include an index of code examples so that they're numbered the same way that they appear in print.
More to come. Follow @SocialWebMining to get these updates in your twitter stream.