Below is a Prezi on Twitter in Education. It looks at 3 aspects:
a) What is Twitter? - a brief overview including Tips for Teachers by David Hopkins
b) Twitter for Lifelong Learning - emphasising the benefits a PLN (Professional Learning Network) and how much educators can learn from and share with each other
c) Twitter in the Classroom - examples of how Twitter can be used in a classroom including 'Thirty Interesting Ways* to use Twitter in the Classroom' by Tom Barrett et al.