A colleague shared this link on a list serve pertaining to the many uses of Twitter in instruction sessions. It is a very fascinating read, indeed! Dunlap, J., & Lowenthal, P. R. (2009). Instructional uses of Twitter. In P. R. Lowenthal, D. Thomas, A. Thai, & B. Yuhnke, B. (Eds.), The CU Online Handbook: Teach Differently: Create and collaborate (pp. 46-52). Raleigh, NC: Lulu Enterprises message posted to web4lib@webjunction.org. Follow this link to view the Blog:
http://mobile-libraries.blogspot.com/2009/12/book-chapter-instructional-uses-of.html
You may even find the entire book useful, as Web 2.0 technologies are discussed indepth. Don't just read, implement!
-Sharon