Style Guide For Business Writing

I'm an instructor / developer with a large midwest insurance company. In that role, I teach writing skills to our employees. While I have many other style guides, this book by FranklinCovey is a delightful surprise. It has 440 magazine quality pages with vivid color illustrations, side bars, explanations, definitions, descriptions, and examples. If you're looking for a comprehensive style guide that you'll be happy with on your first purchase, make this book your first choice.

Make the most of your messages on Twitter, Facebook, and other social networking sites
The advent of Twitter and other social networking sites, as well as the popularity of text messaging, have made short-form communication an everyday reality. But expressing yourself clearly in short bursts-particularly in the 140-character limit of Twitter-takes special writing skill.