Twitter Experiment | Twitter in the College Classroom
[note: you can see the basic concept in the first 90 seconds]
Dr. Rankin at the University of Texas at Dallas has set up this YouTube account with 2 videos to explain Twitter in the classroom concept and how to create a twitter account.
This post on Twitter in the classroom might also be helpful + interesting:
http://steve-wheeler.blogspot.com/2009/01/teaching-with-twitter.html
And this post on Twitter in higher education may also provide some fruitful ideas for education technologists and university professors who want to integrate social media tools into the classroom:
http://web20teach.blogspot.com/2007/08/twitter-tweets-for-higher-education.html