Need Examples of creative Government uses of Facebook & Social Media for book

Hi everyone -- I am writing a book -- Facebook Marketing: An Hour a Day for Sybex/Wiley Publishing. We will have a chapter that includes a lot of information on Facebook Marketing for government agencies/scenarios.

I'm looking for a few great, creative examples from you to highlight in the book. Who broke through the challenges to create a really interesting and effective social media or Facebook initiative for their government agency?

Thanks in advance for your help... and feel free to respond privately if you'd prefer.

Chris Treadaway