As teachers think about using twitter in the classroom, they can consider how they will evaluate the various academic skills that students learn. This digital age learning twitter rubric hopefully can assist them.

Harry G. Tuttle's Web 2.0 Twitter Rubric
My book, Formative Assessment: Responding to Students, is available through Eye-on-Education.
Errors above… “@” should be “(c)”
“harsh marks” should be “hash marks”
Rubrics by definition measure the same learning outcome or standard in different learning activities — are these really rubrics or activity specific scoring keys? Publishing a measurable standard that the rubric measures would add value to this resource.
Hello Harry
Just thought I’d let you know that I’ve taken this topic up in my blog post today at http://blogs.educationau.edu.au/ksmith/2009/10/21/assessing-learning-with-web-20-twitter/
Thank you for sharing. I found this useful in helping me to shape my rubric for the class I am teaching.